Unit 7 Test

• Bromide has a 2- charge.

• There are two magnesium ions to every bromide ion.

• There are two bromide ions and one magnesium ion

• Bromide has a 2+ charge

When an atom loses an electron, it becomes a ____.

• positive ion (cation)

• negative ion (anion)

• neutral ion

• neutral atom

An ionic bond is the attraction between ____.

• similarly charged ions

• oppositely charged ions

• neutral ions

• neutral atoms

Ions that are made of more than one atom are examples of ____.

• polyatomic ions

• negative ions

• positive ions

• neutral ions

What is the chemical name for the compound with the formula Na₂S?

• sodium fluoride

• magnesium sulfide

• lithium oxide

• sodium sulfide

A chemical bond formed when two atoms share electrons is called a (an) ____.

• ionic bond

• covalent bond

• polyatomic bond

• crystal bond

What is a double bond?

• a bond between two atoms

• one pair of electrons shared between two atoms

• two pairs of electrons shared between two atoms

• two pairs of electrons shared between four atoms

A covalent bond in which electrons are shared unequally is ____.

• polar

• a double bond

• ionic

• polyatomic

Electrons involved in bonding between atoms are ____.

• valence electrons

• inside the nucleus

• closest to the nucleus

• positively charged

What is the greatest number of valence electrons an atom can have?

• 2

• 3

• 8

• 12