Chapter 18 Chemical Bonds

The elements that make up a compound and the number of atoms of each element in a unit of the compound can be shown in a

• superscript.

• chemical symbol.

• chemical formula.

• subscript.

In chemical formulas, the number of atoms in a unit of the compound is shown by numbers called

• subscripts.

• oxidation numbers.

• superscripts.

• hydrates.

When an atom loses an electron, it becomes a

• neutral atom.

• cation.

• anion.

• neutral ion.

Electrons involved in bonding between atoms are

• closest to the nucleus.

• valence electrons.

• inside the nucleus.

• positively charged.

Electrons involved in bonding between atoms are

• closest to the nucleus.

• valence electrons.

• inside the nucleus.

• positively charged.

In a chemical formula for an ionic compound, which item is written first?

• positive ion

• charge

• subscript

• negative ion

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

• 2

• 12

• 8

• 3

When atoms gain or lose electrons, the charged particles that result are called molecules.

• True

• False

The valence electrons are those electrons most tightly held by the atom.

• True

• False

Molecules are neutral.

• True

• False