Zr

Zirconium-99

Protons (Z)

40

Neutrons (N)

59

Mass number

99

Half-Life

2.1 s

Abundance

---

Mass

98.917 u

Mass Excess

-77,617.0 keV

Spin

1/2+

Discovered

1970

Binding energy per nucleon

8,539 keV

Neutron separation energy

4,406 keV

Proton separation energy

12,617 keV

Decay Mode

β⁻Niobium-99100%

Decay chain

Zirconium-99Z 40 · N 592.1 s
β⁻100%
β⁻100%
β⁻100%
β⁻100%