Question 1

Which of the following best describes what happens when a sodium atom forms a sodium ion ($$\mathrm{Na^+}$$)?

Accepted Answer

It loses one electron and the number of protons stays the same.

Question 2

What is the charge on an ion formed when a magnesium atom (Group 2A) loses two electrons?

Accepted Answer

$$+2$$

Question 3

Which of the following statements about ionic bonds is correct?

Accepted Answer

Ionic bonds form when a metal transfers electrons to a nonmetal.

Question 4

A chlorine atom (Group 7A) forms an ion by:

Accepted Answer

Gaining one electron to form $$\mathrm{Cl^-}$$

Question 5

Which of the following ions has the same number of electrons as neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 6

Why do cations generally have smaller atomic radii than their neutral atoms?

Accepted Answer

Because they lose electrons, allowing the remaining electrons to be pulled closer by the nucleus.

Question 7

Which of the following best explains why nonmetals tend to form anions?

Accepted Answer

Nonmetals have high ionization energies and tend to gain electrons.

Question 8

What is the electron configuration of a $$\mathrm{Cl^-}$$ ion?

Accepted Answer

Same as argon ($$\mathrm{Ar})$$

Question 9

Which of the following is the correct name for the ion $$\mathrm{O$$^{2-}$$}$$?

Accepted Answer

Oxide ion

Question 10

A neutral atom of potassium ($$\mathrm{K}) $$has 19 protons and 19 electrons. What is the charge and electron count of the ion it forms?

Accepted Answer

Charge: $$+1$$, Electrons: 18

Question 11

Which of the following best describes the octet rule as it applies to main group elements?

Accepted Answer

Atoms gain or lose electrons to have 8 electrons in their valence shell.

Question 12

Which of the following is true about the formation of $$\mathrm{Mg$$^{2+}$$}$$ from a magnesium atom?

Accepted Answer

It loses two electrons and the number of protons remains unchanged.

Question 13

What is the correct formula for the compound formed between sodium and chlorine?

Accepted Answer

$$\mathrm{NaCl}$$

Question 14

Which of the following ions is isoelectronic with neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{F^-}$$

Question 15

When naming a simple ionic compound, which rule is followed for the anion?

Accepted Answer

The anion name ends with '-ide'.

Question 16

Which of the following best explains why metals tend to form cations?

Accepted Answer

Metals have low ionization energies and lose electrons easily.

Question 17

A fluorine atom has 9 protons and 9 electrons. What is the charge and electron count of the fluoride ion ($$\mathrm{F^-}$$)?

Accepted Answer

Charge: $$-1$$, Electrons: 10

Question 18

Which of the following is a correct statement about the relationship between group number and valence electrons for main group elements?

Accepted Answer

The group number equals the number of valence electrons.

Question 19

Which of the following best describes what happens to the size of an atom when it forms a cation?

Accepted Answer

The atom gets smaller because it loses electrons and the remaining electrons are pulled closer to the nucleus.

Question 20

Which of the following is the correct name for the ion $$\mathrm{N$$^{3-}$$}$$?

Accepted Answer

Nitride ion

Ionic and Molecular Compounds: Formation, Electron Transfer, and Ion Nomenclature

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