Calcium-41 (Ca-41)

Identity

Protons

20

Neutrons

21

Mass number

41

Mass

40.96 ± 0.15 u

Mass excess

-35.138 MeV

Spin

7/2-*

Stability

Half-life: 9.94 × 10⁴ years

Natural occurrence

Not found in nature

Decays to

• electron capture → K-41