Same as the Atomic Number.

NEGATIVE charge of -1

Mass = 0 amu.

Has a charge of 0

Mass = 1 amu.

Mass number - Protons (Atomic Number) = ________

Number of Protons is equal to the

Number of Electrons is equal to:

(Neutral Atom)

Number of Neutrons is equal to:

Atomic Mass (or mass number) is equal to

__________ + _________

(Pick 2)

Mass Number is a whole number and is equal to the:

Atoms of the same element with different MASSES is called:

Example: Carbon 12 and Carbon 13

Average Atomic Mass is based on calculating the mass of:

Example: Hydrogen 2 occurs 3% of the time, Hydrogen 1 occurs 97% of the time.