ATOMIC MASS

+ POSITIVE - CATION

- NEGATIVE - ANION

FISSION - splitting of nucleus

FUSSION - combining of nuclei

ATOMIC NUMBER (Z) - The number of protons (p+) in the nucleus

MASS NUMBER / ATOMIC MASS (A) - total number of protons and neutron n^0 in the nucleus

Number of Protons = Atomic Number

Electrons = Protons − Charge (if positive)

Electrons = Protons + Charge (if negative)

Neutrons = Mass Number − Atomic Number

• Atomic Number = number of protons

• Mass Number = protons + neutrons

ISOTOPES - Elements that has the same number of proton but different number of neutron

AVERAGE ATOMIC MASS

- weight average mass of the atoms in a naturally occurring sample of the elements