Magnesium occurs naturally in only three isotopes. ^24 Mg has an isotopic mass of 23.9850 amu and an abundance of 78.99%. ^25 Mg has an isotopic mass of 24.9858 amu and an abundance of 10.00%. Find the mass number of the last isotope of magnesium.

Can someone please explain how to solve this? *done mine the notes*

Answer:

blue white green and brownn

Explanation:

seen one

Answer:  an element with a high electronegativity and an element with a single valence electron  

is the correct answer

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Answer:

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"Why?"

For instance, fluorine is the most reactive non-metal element on the periodic table. Due to it's small size, as well as it's strong electronegativity, fluorine has a strong tendency to accept electrons from other atoms and ions. But when Fluorine comes in contact with Hydrogen (a single valence electron element), for instance, it immediately reacts, resulting in an explosion.

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Hope this helps!

According to forces of attraction and as boiling point is 100°C pure water cannot exist as a liquid at 110° C.

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

Condensation

Explanation:

Answer:

Condensation

Explanation:

When a gas changes to a liquid it is known as condensation. It happens when molecules in a gas slowly reduce their movement speed.

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Answer:

chemical change is a where a variation occurs when several reactants are combined or mixed together.

physical change is a process whereby you gain or lose energy as you cool or heat it.

Explanation:

Answer:

Firms produce goods and services,which they sell to households in return for revenue.

Answer: Goods and Services

Explanation:

Answer:

Hey mate.....

Explanation:

This is ur answer....

Charts, tables, and graphs help communicators organize that data in a way that helps their audiences understand the story the data tells and, hopefully, interpret it correctly.

Hope it helps!

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Chemical change cuz you are adding another substance to your water which changes the molecular structure of the water.

To be in the path of totality means that

The path of totality is the track the Moon's umbral shadow leaves across the surface of the Earth. Its width measures up to 200 miles and its length measures up to 10,000 miles.

When the moon covers the earth's surface, a total solar eclipse has occurred.

An individual who is on the path of totality can observe the occurrence of a total solar eclipse within a short while.

Summarily, a person who is on the path of totality can see a total lunar eclipse.

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Answer:

D

Explanation:

I did it on a quiz.

Answer:

the answer is b

Explanation:

Physical changes affect a substance's physical properties but do not alter its chemical structure. Types of physical changes include boiling, clouding, dissolution, freezing, freeze-drying, frost, liquefaction, melting, smoke and vaporization.

Answer:

d. a row of elements

Explanation:

Elements that are in the same group, have same number of electrons and make up a column in a periodic table.

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The phrase which best describes a period on the periodic table is; a row of elements.

The elements in the periodic table are divided into rows and columns. The rows are called the periods while the columns are called the groups.

This means that a period is best described as a row of elements from the foregoing.

Therefore, the correct answer is option D: a row of elements.

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Answer:

2 ka A. nitrogen, oxygen, Carbon dioxide

Answer:

no 1 Ans gas

hope it works

Answer:

The energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.

so simple question.

Answer:

Potential energy is stored energy that an object has because of its position.

Explanation:

Consider an example where a ball is thrown from a tall building. The point at which the ball is at its maximum height is said to have the maximum potential energy. As the ball gradually falls down, the potential energy decreases and turns into another form of energy, kinetic energy (energy in the form of motion). The ball at its peak position had stored energy, however, as soon as it begins moving, the stored energy will become less.  

You can think of it this way where the ball has less and less distance to cover when falling downwards from the building. This shorter distance covered by the ball is proportional to the potential energy, so when the ball is about to hit the ground, the potential energy will be close to 0.

I hope this makes more sense!

Answer:

So why hasn't it changed? The biggest reasons the U.S. hasn't adopted the metric system are simply time and money. When the Industrial Revolution began in the country, expensive manufacturing plants became a main source of American jobs and consumer products.

Answer:

Further scientific studies showed that an atom can further be divided into subatomic particles electrons, neutrons, and protons. Thus the idea of the indivisibility of an atom changed when new evidence was discovered.

Answer:

The value of gravitational constant on the surface of the moon is 1.625 m/s²

Answer:

B

Explanation:

Answer:

9.8×10^-4...... is the answer

Answer: gasoline, water, sea water, chloroform and mercury so B

Explanation:

Answer:

Explanation:

Hello there, I think this is a limiting agent question.

When 3 moles of Mg is reacted with 2 moles of Br2, because of ratio, we just need 1.5 moles of Br2, so Mg is a limiting agent.

So 3 moles of Mg will make 3 moles of MgBr

Answer:

Use the given functions to set up and simplify

Mg+Br2→MgBr⋅2.

3=

2=

Mg+Br2→gBr⋅2=r2B+gM→MgBr⋅2

Explanation:

SORRY IF I AM WRONG HAVE A BLESS DAY :D

Answer:  120 Teaspoons

Explanation:  

TS = Teaspoons; R = Recipe ; S=Servings

(2 TS/R)/(10S/R) = (10S/2TS)

(600S)/(10S/2TS) = 120 TS

Answer:

I think copper

Explanation:

Material IACS % Conductivity

Silver                105

Copper            100

Gold               70

Aluminum         61

Nickel              22

Zinc                          27

Brass                  28

Iron                        17

Tin                      15

Phosphor Bronze  15

Lead                      7

Nickel Aluminum Bronze 7

Steel                   3 to 15

the table might help- your indian brother

Answer: Covalent

Explanation: By definition, covalent bonds are those in which the shared electrons are shared greater than 50% of the time between two atoms.

The parts of the text on the page that use examples of how the flow of matter through a system is energy driven and has the capacity to do work are;

1) The flow of water down rivers passing through hydro power dams to perform the following works;

2) The flow of electrons that corresponds to the flow of electricity (in the reverse direction) to perform the following works;

3) The lifting of the hammer by the cam which gains gravitational potential energy that is converted to kinetic energy as the hammer drops

The hammer is repeatedly lifted and dropped by the cam to do the following work

4) The chemical potential energy stored in bonds by virtue of the relative atomic distances which produces kinetic energy from the chemical potential energy

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Answer:

density =  7.02 g/mL

Explanation:

density is mass over volume, just divide

d = 625 g/89 mL = 7.02 g/mL