Rubidium-84 (Rb-84)

Identity

Protons

37

Neutrons

47

Mass number

84

Mass

83.9 ± 2.4 u

Mass excess

-79.759 MeV

Spin

2-*

Stability

Half-life: 32.8 days

Natural occurrence

Not found in nature

Decays to

• positron emission 96.1 % → Kr-84
• beta minus 3.9 % → Sr-84