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3 years ago

In an ionic crystal, these attract each other.

1 answer:

6 0

Ionic crystals are made from ions that are bonded together by ionic bonds. An example is salt crystals that are made of sodium and chloride ions.

Explanation:

An ionic bond is formed when one atom donates electrons to another atom so they both attain stable electron configuration. The two atoms are then bound by their acquired charges. For example sodium atom2.8.1) donates its valence electrons to chlorine atom (2.8.7). They both achieve stable electron configuration of 2.8 and 2.8,8 respectively. Because sodium ion will now have a positive charge (because it has more protons than electrons) and chloride ion will have a negative charge because it has more electrons than protons, the two are bonded together electrostatically forming ionic bonds.

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(True or

marysya [2.9K]

The eight-element periodicity found in the Periodic Table is related to the number of electrons in the outermost energy level of the atoms that make up each element
this statement is true

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3 years ago

What is the molarity of 20.2 g of potassium nitrate, KNO3, in enough water to make 250.0 mL of solution

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Answer:

0.8M

Explanation:

CM=n/V

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3 years ago

When a strontium atom loses two electrons, it becomes a(n) _____ with a charge of _____?

Iteru [2.4K]

<span>When a strontium atom loses two electrons, it becomes a(n) cation with a charge of 2+.
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3 years ago

According to the Big Bang Theory, the Universe is expanding. Galaxies are constantly shifting away from one another at different

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According to the Big Bang Theory, the Universe is expanding, hence option A is correct

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Big Bang Theory is a theory about the origin and the nature of the universe and the earth we live in.

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2 years ago

If helium effuses through a porous barrier in 1.34 min, how much time (in min) would it take the same amount of ammonia to effus

timofeeve [1]

Answer:

The time taken the same amount of ammonia to effuse through the same barrier under the same conditions is 2.76 minutes.

Explanation:

Let the volume of the helium gas be = V

Time taken by the helium gas = t = 1.34 min

Effusion rate of helium gas = $R=\frac{V}{1.34 min}$

If V volume of ammonia effuse through same porous barrier the effusion rate of ammonia gas will be given as:

$R'=\frac{V}{t'}$

Using Graham's Law.

This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

$\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}$

Molar mass of helium gas = M = 4 g/mol

Molar mass of ammonia gas = M' = 17 g/mol

$\frac{R}{R'}=\sqrt{\frac{M'}{M}}$

$\frac{\frac{V}{1.34 min}}{\frac{V}{t'}}=\sqrt{\frac{17 g/mol}{4 g/mol}}$

$t'=1.34 min\times \sqrt{\frac{17 g/mol}{4 g/mol}}=2.76 min$

The time taken the same amount of ammonia to effuse through the same barrier under the same conditions is 2.76 minutes.

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3 years ago