Question 1

Which of the following best describes the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight electrons in their highest energy level.

Question 2

What is the maximum number of electrons that can be found in the third energy level ($$n=3) of an $$atom?

Accepted Answer

$$18$$

Question 3

Which formula is used to calculate the maximum number of electrons in an energy level?

Accepted Answer

$$2n^2$$

Question 4

A sodium atom ($$Na) $$loses one electron to form a sodium ion. What is the charge and name of this ion?

Accepted Answer

Positive, sodium cation

Question 5

Which of the following ions is isoelectronic with neon ($$Ne$$)?

Accepted Answer

$$Na^+$$

Question 6

What is the correct chemical formula for the ionic compound formed between calcium ions ($$Ca^{2+}) $$and chloride ions ($$Cl^-$$)?

Accepted Answer

$$CaCl_2$$

Question 7

Which of the following statements about ionic compounds is TRUE?

Accepted Answer

Ionic compounds are formed by the transfer of electrons from metals to nonmetals.

Question 8

What is the name of the compound $$FeO$$?

Accepted Answer

Iron (II) oxide

Question 9

Which of the following ions is a polyatomic ion?

Accepted Answer

$$SO_4$$^{2-}$$

Question 10

If an atom of bromine ($$Br) $$gains one electron, what is the resulting ion and its charge?

Accepted Answer

$$Br^-$$, anion

Question 11

Which of the following is the correct formula for aluminum phosphate?

Accepted Answer

$$Al_2$$($$PO_4)_3$

Question 12

A magnesium atom ($$Mg) $$has 12 electrons. How many electrons are in its second energy level ($$n=2$$)?

Accepted Answer

$$8$$

Question 13

Which of the following best explains why noble gases are generally unreactive?

Accepted Answer

They have a full valence shell of eight electrons (except helium).

Question 14

What is the correct name for the compound $$CuCl_2$$?

Accepted Answer

Copper (II) chloride

Question 15

Which of the following ions has a charge of $$-2$$?

Accepted Answer

$$SO_4$$^{2-}$$

Question 16

What is the correct formula for barium sulfate?

Accepted Answer

$$BaSO_4$$

Question 17

Which of the following is the correct formula for sodium carbonate?

Accepted Answer

$$Na_2CO_3$$

Question 18

If a potassium atom ($$K) $$loses one electron, what is the resulting ion and its charge?

Accepted Answer

$$K^+$$, cation

Question 19

Which of the following is the correct name for $$Ca_3$$($$PO_4)_2$?

Accepted Answer

Calcium phosphate

Question 20

Which of the following ions is formed when oxygen gains two electrons?

Accepted Answer

$$O^{2-}$$

Chapter 3: Octets of Electrons – Electron Arrangements and the Octet Rule

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