Q: Which of the following correctly represents the Lewis symbol for nitrogen ($$\mathrm{N}$$)?

$$\mathrm{N}$$ \text{ with five dots around it}

Question 1

Which of the following best describes the difference between an atom, a molecule, and a compound?

Accepted Answer

An atom is a basic unit of matter, a molecule is a group of two or more atoms chemically bonded, and a compound is a molecule containing atoms of different elements in fixed proportions.

Question 2

How many total atoms are present in one molecule of $$\mathrm{Li_2SO_4}$$?

Accepted Answer

8

Question 3

Which of the following ions is written with an incorrect charge based on its position in the periodic table?

Accepted Answer

$$\mathrm{K$$^{2+}$$}$$

Question 4

What is the correct formula for the compound formed between magnesium ($$\mathrm{Mg}) $$and fluorine ($$\mathrm{F}$$)?

Accepted Answer

$$\mathrm{$$MgF_2$$}$$

Question 5

Which of the following correctly represents the Lewis symbol for nitrogen ($$\mathrm{N}$$)?

Accepted Answer

$$\mathrm{N}$$ 	ext{ with five dots around it}

Question 6

Which of the following ions is most likely to form from sulfur ($$\mathrm{S}$$), based on its position in the periodic table?

Accepted Answer

$$\mathrm{S$$^{2-}$$}$$

Question 7

Which of the following best explains why sodium ($$\mathrm{Na}) $$forms a $$\mathrm{Na^+}$$ ion?

Accepted Answer

Sodium has one valence electron and loses it to achieve a stable octet.

Question 8

Which of the following is the correct formula for the compound formed between aluminum ($$\mathrm{Al}) $$and oxygen ($$\mathrm{O}$$)?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 9

Which of the following statements about transition metals is correct?

Accepted Answer

Transition metals can form ions with variable positive charges, indicated by Roman numerals.

Question 10

What is the correct formula for the compound formed between calcium ($$\mathrm{Ca}) $$and nitrogen ($$\mathrm{N}$$)?

Accepted Answer

$$\mathrm{Ca_3N_2}$$

Question 11

Which of the following best describes the octet rule?

Accepted Answer

Atoms bond to achieve eight electrons in their outermost shell.

Question 12

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{SO_4$^{2-}}$$

Question 13

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

$$\mathrm{Ba(OH)_2}$$

Question 14

Which of the following is the correct formula for the compound formed between lithium ($$\mathrm{Li}) $$and oxygen ($$\mathrm{O}$$)?

Accepted Answer

$$\mathrm{Li_2O}$$

Question 15

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two nonmetals.

Question 16

Which of the following is the correct formula for the compound formed between sodium ($$\mathrm{Na}) $$and sulfur ($$\mathrm{S}$$)?

Accepted Answer

$$\mathrm{Na_2S}$$

Question 17

Which of the following is the correct formula for the compound formed between magnesium ($$\mathrm{Mg}) $$and chlorine ($$\mathrm{Cl}$$)?

Accepted Answer

$$\mathrm{$$MgCl_2$$}$$

Question 18

Which of the following correctly represents manganese (II)?

Accepted Answer

$$\mathrm{Mn$$^{2+}$$}$$

Question 19

Which of the following best describes the process of forming an ionic bond?

Accepted Answer

Electrons are transferred from a metal to a nonmetal.

Question 20

Which of the following is the correct formula for the compound formed between aluminum ($$\mathrm{Al}) $$and sulfur ($$\mathrm{S}$$)?

Accepted Answer

$$\mathrm{Al_2S_3}$$

Ionic and Molecular Compounds: Structure, Bonding, and Formulas

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