Question 1

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

Accepted Answer

Sodium loses one electron to have the same number of electrons as neon.

Question 2

Which of the following compounds is most likely to be ionic?

Accepted Answer

$$\mathrm{K_2O}$$

Question 3

What is the correct formula for the ion formed by sulfur, which has 16 protons and 18 electrons?

Accepted Answer

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

Question 4

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from a metal to a nonmetal, while covalent bonds involve the sharing of electrons between nonmetals.

Question 5

Which of the following elements is most likely to form a $$2+$$ ion?

Accepted Answer

Magnesium ($$\mathrm{Mg})$$

Question 6

What is the correct name for the molecular compound $$\mathrm{$$NCl_3$$}$$?

Accepted Answer

Nitrogen trichloride

Question 7

Which of the following best describes the bond in $$\mathrm{H_2O}$$?

Accepted Answer

Polar covalent

Question 8

A patient is found to have low levels of potassium ions in their blood. Which of the following is the correct symbol for the potassium ion?

Accepted Answer

$$\mathrm{K^+}$$

Question 9

Which of the following Lewis structures correctly represents ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

A nitrogen atom with three single bonds to hydrogen atoms and one lone pair on nitrogen.

Question 10

Which of the following compounds contains a triple bond in its Lewis structure?

Accepted Answer

$$\mathrm{N_2$}$$

Question 11

What is the correct molecular formula for diphosphorus pentoxide?

Accepted Answer

$$\mathrm{P_2O_5}$$

Question 12

Which of the following best describes the trend of electronegativity in the periodic table?

Accepted Answer

It increases from left to right across a period and decreases from top to bottom in a group.

Question 13

A bond between sodium ($$\mathrm{Na}) $$and chlorine ($$\mathrm{Cl}) is $$best described as:

Accepted Answer

Ionic

Question 14

Which of the following pairs of elements will form a nonpolar covalent bond?

Accepted Answer

H and H

Question 15

What is the correct name for the compound $$\mathrm{Cl_2O_7}$$?

Accepted Answer

Dichlorine heptoxide

Question 16

Which of the following best explains why calcium ($$\mathrm{Ca}) $$forms a $$2+$$ ion?

Accepted Answer

Calcium loses two electrons to have the same number of electrons as argon.

Question 17

Which of the following is the correct Lewis structure for $$\mathrm{F_2$} ($$fluorine molecule)?

Accepted Answer

Each fluorine atom shares one pair of electrons (single bond) and has three lone pairs.

Question 18

A compound is found to contain only nonmetals and its name includes prefixes such as 'di-' and 'tri-'. What type of compound is it most likely to be?

Accepted Answer

Molecular (covalent) compound

Question 19

Which of the following best describes the bond in $$\mathrm{CO_2$}$$?

Accepted Answer

Nonpolar covalent

Question 20

A patient is prescribed a supplement for bone health. Which ion is most directly associated with bone structure in the human body?

Accepted Answer

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

Ions, Ionic and Covalent Bonds, and Electron Transfer: Week 4 Study Notes

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