Basic Chemistry for Biology Students Quiz

What is the octet rule in the context of chemical bonding?

• Atoms are stable with a full outer shell of electrons.

• Atoms are stable with an empty outer shell of electrons.

• Atoms are stable with a single electron in the outer shell.

• Atoms are stable with no electrons in the outer shell.

Why is hydrogen considered an unhappy atom?

• It has a full outer shell.

• It has one electron in its outer shell, which can hold two.

• It has two electrons in its outer shell, which can hold eight.

• It has no electrons in its outer shell.

Which of the following atoms is considered happy?

• Lithium

• Hydrogen

• Carbon

• Helium

What happens to sodium when it forms an ionic bond with chlorine?

• Sodium loses two electrons and becomes negatively charged.

• Sodium loses an electron and becomes positively charged.

• Sodium gains an electron and becomes negatively charged.

• Sodium gains two electrons and becomes neutral.

How does chlorine achieve stability in an ionic bond with sodium?

• By losing an electron.

• By gaining an electron.

• By sharing electrons equally.

• By gaining two electrons.

What is the charge of a chlorine ion after it gains an electron?

• Positive

• Neutral

• Negative

• Double positive

What holds the ions together in a salt crystal?

• Covalent bonds

• Metallic bonds

• Ionic bonds

• Hydrogen bonds

How many electrons will a magnesium atom typically give up to become an ion?

• Three

• Two

• Four

• One

In the compound sodium sulfide (Na2S), what is the charge on the sulfur ion?

• Minus one

• Minus two

• Plus one

• Plus two

What is the main reason positively charged ions stick to negatively charged ones?

• They have opposite charges.

• They have similar charges.

• They have no charge.

• They have the same number of electrons.