p+

Answer:

proton (symbol)

n0

Answer:

neutron (symbol)

e-

Answer:

electron (symbol)

# protons (atom is defined by this)

Answer:

Atomic #

# protons + # neutrons

Answer:

Mass #

different # of neutrons

Answer:

Isotope

group

Answer:

Verticals on the periodic table

period

Answer:

Horizontals on the periodic table

Molecule

Answer:

2 or more covalently bonded atoms

H2, F2, N2, O2, Cl2, Br2, I2

Answer:

Diatomic Molecules