The first column of the periodic table is called the

Answers

Answer 1
alkali metals
if i’m correct pls mark me brainliest <3

Related Questions

Refer to your periodic table:


Which of the following has the smallest atomic radius?


Bromine


Astatine


Iodine


Fluorine

Answers

iondine

Explanation:

bromine has 185pm, astatine haa 200, iondine has 140 and lastly fluorine has 147. so iondine has the smallest atomic radius

25 POINTS
Boyd takes additional measurements of the mass of product formed in a reaction. He uses a balance that has smaller graduations than the first balance he used.
What is Boyd most likely trying to change?

Options:
He is trying to increase his accuracy but not his precision.
He is trying to increase his precision but not his accuracy.
He is trying to decrease his precision and increase his accuracy.
He is trying to increase his precision and decrease his accuracy.

Answers

Answer:

The correct option is A: "He is trying to increase his accuracy but not his precision"

Explanation:

Accuracy of measurement is when the value of the measurement is close to the actual value of that measurement while precision is when the experiment is repeated using the same instrument but obtaining different values.

When Boyd changed the weighing balance in his experiment to a smaller one, the smaller weighing balance has better accuracy (smaller graduations) than the initially used one because the smaller weighing balance will provide a value close to the actual value of the mass of the product. If he had, however, repeated the experiment without changing the weighing balance, he would have sought to increase his precision.

From the description above, it can be said that Boyd was trying to increase his accuracy but not his precision

Answer:

The correct option is A: "He is trying to increase his accuracy but not his precision"

Explanation:

right on EDGE 2021

Answer question number 3

Answers

Answer:

A

Explanation:

A mixture is formed when two or more substances are physically mixed together. A compound is formed when two or more substances are chemically combined through a chemical reaction.

compound name of SO2

Answers

The compound name is SO2 is Sulfur dioxide. I hope this helps!!


What’s this called please help

Answers

Answer:

the answer is a linear

Explanation:

heres a graph different ones at this link

Which phrase best describes igneous rocks?
form when lava and magma cool

accumulate sediments following erosion

require heat and pressure to be formed

consist of many sediment layers
ctivity

Answers

Answer:

A) form when lava and magma cool

please give me brainliest :p

God bless!

Answer:

A: form when lava and magma cools

Explanation:

Got it right on Edge 2020 :)

ultraviolet radiation has a higher frequency than visible light. which type of light wave carries more energy?
a=they carry the same amount of energy
b=visible light
c= ultraviolet radiation

Answers

Answer:

The answer to this question is C; ultraviolet radiation

Explanation:

The the reason for this is because it carries more energy per photon than visible light does. Light travels at a speed of 299,792 kilometers per second (about 186,282 miles per second).

A dull metal object has a density of 8.8 G/ML and a volume of 20 ML calculate the mass

Answers

Answer:

Mass = 0.000176 gram

Steps:

m =  V × ρ

=  20 milliliter × 8.8 gram/cubic meter

=  2.0E-5 cubic meter × 8.8 gram/cubic meter

=  0.000176 gram

Explanation:

In which region is the substance in both the solid phase and the liquid phase?
1 2 3 4

Answers

Answer:

its 2 on ed I promise do not listen to the brainiest

Explanation:

Answer:

B)2

Explanation:

Elements in group to are cold alkaline earth metals what is most similar about alkaline earth metals how many protons and neutrons they have which Chemical properties he have how many total electrons they have which period They have most often found in

Answers

Answer:

explanations below

Explanation:

The alkaline earth metals are the 6 chemical elements that can be found in group two of the periodic table. These elements have a lot of properties in common, in the sense that they are generally shiny, reactive at standard temperature and pressure and they are also silvery-white. The elements are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra)

These metals have two electrons at their orbits, which can be easily lost to form cations (with charge +2, and an oxidation state of +2)  

Below are some of their details

Name: Beryllium  

Number of Protons/Electrons: 4  

Number of Neutrons: 5  

Name: Magnesium  

Number of Protons/Electrons: 12  

Number of Neutrons: 12  

Name: Calcium  

Number of Protons/Electrons: 20  

Number of Neutrons: 20  

Name: Strontium  

Number of Protons/Electrons: 38  

Number of Neutrons: 50  

Name: Barium  

Number of Protons/Electrons: 56  

Number of Neutrons: 81  

Name: Radium  

Number of Protons/Electrons: 88  

Number of Neutrons: 138  

Which of these elements is most likely to be a colorless gas based on the type of element? Al, Pd, Ar, Cs

Answers

Answer:

Al (Aluminum)

Why is the nitrogen cycle considered a closed system?

Answers

Answer:

because nitrogen is fixed by bacteria and assimilated by plants

Explanation:

Answer:

It is a considered a closed system because nitrogen is fixed by bacteria and is taken in by plants.

Explanation:

Which is the IUPAC name for NO?
nitric oxide
binitrogen oxide
dinitrogen dioxide
nitrogen monoxide

Answers

The IUPAC name for NO is nitric oxide. The correct option is A.

What is IUPAC naming?

The International Union of Pure and Applied Chemistry (IUPAC) is a global organization that represents chemistry as well as related sciences and technologies.

The chemical compound's identity is represented by its common and IUPAC names, which differ from one another. Every chemical compound has multiple names.

Complete the following step-by-step response: The IUPAC nomenclature is a standardized name given to organic compounds in accordance with official naming rules.

Nitric oxide, also known as NO, is a colorless gas. It is one of the most important nitrogen oxides.

Nitric oxide is a free radical, which means it has an unpaired electron, which is sometimes represented in its chemical formula by a dot.

Thus, the correct option is A.

For more details regarding IUPAC, visit:

https://brainly.com/question/16631447

#SPJ6

Answer:

D: Nitrogen Monoxide

Explanation:

There's one Nitrogen atom and one Oxygen atom

True or false

Each family represents the number of energy levels present in an atom of the element.

Answers

Answer:

true because of the elements

What is the effect of tap water, sea water, and rainwater on the rusting rate of iron?
(Please i need an answer π-π) ​

Answers

Answer:

The more acidic the solution the faster it rusts. More Na = more rust

Explanation:

what unit of measure would i use to measure the width of my fingernail A millimeters
B centimeters C meters D kilometers
E grams​

Answers

A. Millimeters
Because the width of fingernails are very small and millimeters is the smallest unit of measurement listed.

whats the lewis dot diagram for calcium

Answers

Draw the Lewis dot structure for each atom of the compound to show how many valence electrons are present in each atom. For example, the calcium atom in calcium chloride, CaCl2, has two valence electrons, and the chlorine atoms have seven valence electrons each.

Why MgO will form after Mg reacting with CuO? (mcq)
Mg forms positive ions and O forms negative ions
Mg is more reactive than Cu
CuO have loose bonding

Answers

Answer:

Mg is more reactive than Cu

Explanation:

In the reaction between Mg and CuO to form MgO, MgO will form because Mg is more reactive than Cu.

This kind of reaction is called a single replacement or single displacement reaction.

The replacement of a metallic ion in solution by a metal atom higher in the activity series than the metal in solution falls into this category of reactions. The element Mg is higher than Cu in the activity series. The higher an element is in the activity series, the more reactive they are. Since Mg is more reactive, it will displace the Cu from CuO.

why is lithium used in the body?

Answers

Answer:

11

Explanation:


The density of air at STP is 1.285 g/L. Which of the following cannot be used to fill a balloon that will float in air at STP?

Answers

NO can't  be used to fill a balloon

Further explanation

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.

Answer options that need to be added :

a. Ne

b. NO

c. NH₃

d. CH₄

e. HF

will float in air ⇒ element or compound to fill the balloon, its density must be less than < 1.285 g/L

We can use the ideal gas formula ta find density :

[tex]\tt \rho=\dfrac{P.MW}{RT}[/tex]

Because at STP, then the constant value is

[tex]\tt \rho=\dfrac{1~atm\times MW}{0.08205\times 273.15~K}\\\\\rho=0.0446\times MW[/tex]

So that the density is determined from the MW(molecular weight) of each element or compound

a. Ne

Ar = 20.1797 g/mol

[tex]\tt \rho=0.0446\times 20.1797=0.9~g/L[/tex]

b. NO

MW=30.006 g/mol

[tex]\tt \rho=0.0446\times 30.006=\boxed{\bold{1.338~g/L}}[/tex]

c. NH₃

MW=17.0306 g/mol

[tex]\tt \rho=0.0446\times 17.0306=0.760~g/L[/tex]

d. CH₄

MW=16.04 g/mol

[tex]\tt \rho=0.0446\times 16.04=0.715~g/L[/tex]

e. HF

MW=20.01 g/mol

[tex]\tt \rho=0.0446\times 20.01=0.892~g/L[/tex]

How many neutrons make up one of these potassium atoms?

Answers

Potassium has twenty neutrons

Answer:

20

Explanation:

What happens to the particles of a liquid when energy is removed from them?

A. The motion of the particles increases and the distance between the particles increases.

B. The motion of the particles increases and the distance between the particles decreases.

C. The motion of the particles decreases and the distance between the particles increases.

D. The motion of the particles decreases and the distance between the particles decreases.

Answers

Answer:

b im pretty sure it is  b

Explanation  b  The motion of the particles increases and the distance between the particles decreases.

The motion of the particles decreases and the distance between the particles increases, the correct option is C.

What are different states of matter?

The matter is anything that has mass and occupies space.

Matter can exist in four different states: solid, liquid, gas, and plasma.

By examining the arrangement of molecules, it is possible to comprehend the characteristics of the many forms of matter.

The state of a solid turns to a liquid when it is heated past its melting point.

A liquid turns into a gas when it is heated past the point at which it vaporizes.

Solids have a distinct shape and dimension and are densely packed.

Liquids fill the container's space and are loosely packed.

Gas has a large intermolecular distance and is not stiff.

When energy is removed from the particles of a liquid, the speed gets slowed, and so the motion decreases, as the motion is limited they become packed and the distance between them decreases, and the intermolecular forces increases.

To know more about Different states of matter

brainly.com/question/1134312

#SPJ6

-79.6 -80 -81.2. is the correct answer

Answers

um what -80 lol what

Write a complete, balanced chemical equation where tin metal reacts with aqueous hydrochloric acid to produce tin(II) chloride and hydrogen gas. Include states.

From the equation, which element is oxidized, and which element is reduced?

Answers

Answer:

1. The balanced equation is given below:

Sn (s) + 2HCl (aq) –> SnCl₂ (aq) + H₂ (g)

2a. H is oxidized.

2b. Sn is reduced.

Explanation:

1. Balanced equation for the reaction between tin (Sn) metal and aqueous hydrochloric acid (HCl) to produce tin(II) chloride (SnCl₂) and hydrogen gas (H₂).

This is illustrated below:

Sn (s) + HCl (aq) –> SnCl₂ (aq) + H₂ (g)

There are 2 atoms of Cl on the right side and 1 atom on the left side. It can be balance by putting 2 in front of HCl as shown below:

Sn (s) + 2HCl (aq) –> SnCl₂ (aq) + H₂ (g)

Now, the equation is balanced

2. Determination of the element that is oxidize and reduced.

This can be obtained as follow:

We shall determine the change in oxidation number of each element.

NOTE:

a. The oxidation number of H is always +1 except in hydrides where it is –1.

b. The oxidation state of Cl is always –1.

Sn (s) + 2HCl (aq) –> SnCl₂ (aq) + H₂ (g)

For Tin (Sn):

Sn = 0

SnCl₂ = 0

Sn + 2Cl = 0

Cl = – 1

Sn + 2(–1) = 0

Sn – 2 = 0

Collect like terms

Sn = 0 + 2

Sn = +2

Therefore, the oxidation number of Tin (Sn) changes from 0 to +2

For H:

H = +1

H₂ = 0

The oxidation number of H changes from +1 to 0

For Cl:

Cl is always –1. Therefore no change.

Summary:

Element >>Change in oxidation number

Sn >>>>>>>From 0 to +2

H >>>>>>>>From +1 to 0

Cl >>>>>>>No change

Therefore,

Sn is reduced since its oxidation number increased from 0 to +2.

H is oxidized since it oxidation number reduced from +1 to 0

The balanced chemical equation for the reaction is

Sn(s) + 2HCl(aq) → SnCl₂(aq) + H₂(g)

and the element that oxidized is tin (Sn) while the element that is reduced is hydrogen (H)

The balanced chemical equation for the reaction where tin metal reacts with aqueous hydrochloric acid to produce tin(II) chloride and hydrogen gas is

Sn(s) + 2HCl(aq) → SnCl₂(aq) + H₂(g)

From the equation,

The element that is oxidized is tin (Sn), because the oxidation state of Sn increased from 0 to +2

The element that is reduced is hydrogen (H), because the oxidation state of H decreased from +1 to 0.

Hence,

The balanced chemical equation for the reaction is

Sn(s) + 2HCl(aq) → SnCl₂(aq) + H₂(g)

and the element that oxidized is tin (Sn) while the element that is reduced is hydrogen (H).

Learn more here: https://brainly.com/question/12913997

Describe how calcium and fluorine bond together to form calcium fluoride. The electron arrangement of each atom is shown.

Answers

Answer:

Detail is given below.

Explanation:

Calcium is alkaline earth metal. It has two valance electron. Thus calcium needs six more electron to complete the octet. Thus, its very easy for calcium to remove its two electron and get complete octet.

Electronic configuration of Ca:

Ca₂₀ = [Ar] 4s²

While,

Fluorine is halogen. It has seven valance electrons. It needed only one electron to complete the octet. When it combine with calcium , calcium loses two electrons thus two atom of fluorine combine with one atom of fluorine and stable compound calcium fluoride is formed.

Electronic configuration of F:

F₉  = [He] 2s² 2p⁵

Chemical equation:

Ca  + F₂     →     CaF₂

Write the word equations for the following balanced chemical equations.
a. Zn + 2HCl → ZnCl2 + H2
b. 2503 2502 + O2

Answers

Answer:

21

Explanation:9+10

What is the relationship between the latitude and hours of daylight

Answers

Answer:

The tilt of the Earth's axis also defines the length of daylight.Daylight hours are shortest in each hemisphere winter. Between summer and winter

solistice the number of daylight hours decreases and the rate of decrease is larger the higher the latitude.The fewer sunlight hours the colder nights.

What is the correct name for the compound P406?
A. Phosphoric acid
B. Tetraphosphorus hexoxide
C. Phosphorus (IV) oxide
D. Phosphorus oxide

Answers

Answer:

Phosphorus trioxide

Explanation:

Answer:

Tetraphosphorus hexoxide

Explanation:

Give brainliest please

You are about to take a short trip. However, you will not be traveling by car or bus; instead you will be traveling up in a hot air balloon. You know that hot air balloons, like the ones pictured, are able to rise when the air contained in them is heated. Why does the balloon rise? What is happening at the molecular level to make the balloon rise?

Answers

Answer:

Hot air rises. Heated air molecules “spread out” or expand and bounce around, and the space becomes less dense than the surrounding space. Increasing the air temperature inside the balloon envelope makes it less dense than the air, thus making it “lighter than air”.

Explanation:

I'm new to brainly but I hope this helped!

Balloon rise because  Warm air ascends. Heat causes the molecules of the air to "spread out," or expand, and bounce off one another, making the area less dense than the surroundings.

What are molecules ?

A molecule is the smallest unit of a substance that keeps its content and properties. It is made up of two or more atoms that are joined together by chemical bonds.

Chemistry is built on molecules. The element symbol and a subscript indicating the number of atoms are used to identify molecules.

When Balloon rise because  Warm air ascends. Heat causes the molecules of the air to "spread out," or expand, and bounce off one another, making the area less dense than the surroundings.

The air inside the balloon's envelope becomes less dense as the temperature rises, making it "lighter than air."

To learn more about molecules, refer to the below link:

https://brainly.com/question/14130817

# SPJ2

what is 1.23 x 10^-3 in standard notation

Answers

Answer:

=0.00123

Explanation:

Look at the attachments below

Hope this helps (:

Answer:

0.00123

Explanation:

Standard notation is the normal way of writing numbers. Examples include 1, 2, and 10. The number 1.23 x 10^-3 is written in scientific notation. The decimal goes after the first nonzero integer and it is multiplied by a power of 10. The power or exponent attached to the 10 tells you how many places over you need to move the decimal to get back into scientific notation. Examples include 1.00 x 10^2 (representing 100 in standard form because you would move the decimal two places to the right.), 2.0 x 10^1 (representing 20 in standard form because you would move the decimal one place to the right), and 3.0 x 10^-4 (representing 0.0003 in standard form because you would move the decimal four places to the left since it is a negative exponent).

The negative (-3) exponent in 1.23 x 10^-3 indicated to move the decimal three places to the left. If it was positive, you would move it three places to the right.

In 1.23 x 10^-3 move the decimal to the left 1 place to get:

0.123

two places to get:

0.0123

and a third place to get:

0.00123

The final answer is 0.00123

Other Questions
Look at the picture to see question plz help quickly and step by step what is the answer to 6y * 88 = 88 * 6y A sample of an unknown gas weighs 0.419 grams and produced 5.00L of gas at 1.00atm (unknown gas only) and 298.15K, what is the molar mass (g/mole) of this unknown gas A ferris wheel can accommodate 70 people in 20 minutes; how many people could ride the ferris wheel in 4 hours?Proportional Question Apply What Youve Learned - Managing Credit Cards and ConsumerLoansScenario: You are 30 years old, married, have two children, and household income (take-home pay) of$3,500 per month. Your credit and consumer debt is as follows:_______. Car loan, 6% interest rate, $10,000 balance, $295 per month Department store card, 28% interest rate, $600 balance, minimum payment 5% of balance Discover Card, 12% interest rate, $2,000 balance, minimum payment 2% of balance VISA Card, 13% interest rate, $3,000 balance, minimum payment 2% of balance MasterCard 1, 14% interest rate, $4,000 balance, minimum payment 2% of balance MasterCard 2, 14% interest rate, $0 balance, minimum payment 2% of balance Gasoline card, 21% interest rate, $300 balance, minimum payment 5% of balanceAssume all credit cards will assess a $35 late fee and ongoing penalty interest of 8% above the currentrate if you miss a payment. Your recent VISA card statement came with a blank cash advance check(for up to $10,000) with terms of 23.99% APR and a fee of 3% if you use it. Your recent MasterCard 2statement came with a balance transfer oFer (up to $4,000) with no fee and 0% APR for 12 months,after which the normal interest rate applies. You recently found an incorrect amount charged on yourVISA card from a store you frequent often. Youd like to come up with a plan to eliminate all of yourcredit card debt.In general, is it a good idea to make only minimum payments on your credit cards?Yes, you can invest the money saved each month to earn interest.No, it will cause your interest rate to go up.No, the small payment requirement is mathematically guaranteed to keep you in debt for manyyears.Yes, this allows you more exibility in your cash budget.Assuming you have $1,500 in your budget this month with which to pay down your credit cards, howmuch should you pay on each card?CardInterestrateOutstandingRequired minimumRecommendedbalancepayment(%)payment($)debtrepaymentamountstore cardDiscover Card12%2,0008%VISA Card13%3,00010%MasterCard 114%4,0008%MasterCard 214%010%Gasoline card21%30015%Total$9,900$1,500 Whats the mood of the poem icarus ? explanation of atomic radius why is acceleration is a derived quantity PLEASE, PLEASE HELP!!!!!WILL GIVE BRAINLIEST!!!!Which group in England benefited the most from the new Bill of Rights 1689. What is his resolution amount help me plzzzzzzzzzzz -4. Which of the following correctly traces the path of air after it is inhaled?A. epiglottis, trachea, bronchioles, alveoliB. bronchioles, alveoli, epiglottis, tracheaC. epiglottis, bronchioles, alveoli, tracheaD. alveoli, epiglottis, trachea, bronchioles Which mountains lie between Spain and France?RockyPyreneesAlpsAndes Three workers each take home two packs of Post-It notes at a cost of $.67 per pack. plzzz helpppYou are pushing a box North in the hallway, at 20n, and a friend gets in front of the box and goes in the opposite direction, at 30n. What direction is the box going at? How much force does the box have going in that direction? Curtis won 53 pieces of candy playing a game at the county fairAt school he gave one to each of his classmates in his English class. He only has 25 remaining. How many did he give away? These cells have genetic material that is 50% from one parent and 50% from the other parent. O Eukaryotic Prokaryotic 5 6 7 8 Lee has decided to build a shed on a square concrete slab. The shed has the same width, w,as the slab. Its length is 2 m shorter than the width of the slab .a) What is an expression for the area of the shed? A taxi company charges $3 per ride plus $1.50 for each mile traveled. Andrea wants to spend no more than $24 on a taxi ride. How many miles can Andrea travel? Select all that apply. A recipe calls for 4 teaspoons of salt to 12 teaspoons of red pepper flakes. How many teaspoons of salt are needed for each tablespoon of red pepper flakes?