CHEM Day 4 12/11 Unit 4: Chemical Bonding

What is the name given to the electrons of an atom, which are available for chemical bonding?

• orbital electrons

• valence electrons

• anions

• cations

How do metals obey the octet rule when reacting to form compounds?

• they gain electrons

• they lose all of their valence electrons

• they lose some of their valence electrons

• they share electrons

How do nonmetals obey the octet rule when reacting to form compounds?

• they gain electrons

• they lose electrons

• they share electrons

• nonmetals do not obey the octet rule

Which of the following occurs in an ionic bond?

• valence electrons are shared

• Two atoms share two electrons.

• Oppositely charged ions attract.

• Like-charged ions attract.

HCl is an example of

• covalent bond

• metallic bond

• ionic bond

Magnesium bromide is an ionic compound with the chemical formula MgBr2. What does the “2” tell you?

• Bromide has a 2- charge.

• There are two magnesium ions to every bromide ion.

• There are two bromide ions for every magnesium ion.

• Bromide has a 2+ charge.

Which group of elements have full outer shells?

• The alkali metals

• The full gases

• The halogens

• The noble gases

Which of the following is the correct Lewis dot structure for the molecule fluorine (F₂)?

• A

• B

• C

• D

According to the octet rule most elements need _______ valence electrons.

• 2

• 8

• 6

• 18

How many electrons does each line indicate are shared?

• 1

• 2

• 3

• 4