Front

Atom

Back

unit of matter

Front

Proton charge

Back

Positive

Front

Neutron charge

Back

(no charge)

Front

Electron charge

Back

Negative

Front

Nucleus location

Back

of atom

Front

Atomic number

Back

of protons

Front

Mass number

Back

+ Neutrons

Front

Element symbol for Oxygen

Back

O

Front

Isotope

Back

element, different neutrons

Front

Electron shell

Back

level for electrons