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Germanium
Refractive Index of Terbium
Se (Symbol of Selenium)
12 (Atomic Number of Magnesium)
Neel Point of Rubidium in °C

K

Potassium

25 known isotopes (2 stable, 23 radioactive)

Show stable only

³¹K

Mass

31.036780 u

Abundance

—

Half-life

10 picoseconds

Spin/Parity

—

Decay Mode(s)

Proton emission (100%)

³³K

Mass

33.008095 u

Abundance

—

Half-life

25 nanoseconds

Spin/Parity

—

Decay Mode(s)

Unknown

³⁴K

Mass

33.998690 u

Abundance

—

Half-life

25 nanoseconds

Spin/Parity

—

Decay Mode(s)

Unknown

³⁵K

Mass

34.988005 u

Abundance

—

Half-life

178 milliseconds

Spin/Parity

(3/2)+

Decay Mode(s)

EC/β⁺ (100%), ECP (0.37%)

³⁶K

Mass

35.981302 u

Abundance

—

Half-life

341 milliseconds

Spin/Parity

2+

Decay Mode(s)

EC/β⁺ (100%), ECP (0.048%), ECA (0.0034%)

³⁷K

Mass

36.973376 u

Abundance

—

Half-life

1.225 seconds

Spin/Parity

3/2+

Decay Mode(s)

EC/β⁺ (100%)

³⁸K

Mass

37.969081 u

Abundance

—

Half-life

7.651 m

Spin/Parity

3+

Decay Mode(s)

EC/β⁺ (100%)

³⁹K Stable

Mass

38.963706 u

Abundance

93.2581%

Half-life

Stable

Spin/Parity

3/2+

Decay Mode(s)

—

⁴⁰K

Mass

39.963998 u

Abundance

0.0117%

Half-life

1.248E+9 years

Spin/Parity

4-

Decay Mode(s)

β⁻ (89.28%), EC/β⁺ (10.72%)

⁴¹K Stable

Mass

40.961825 u

Abundance

6.7302%

Half-life

Stable

Spin/Parity

3/2+

Decay Mode(s)

—

⁴²K

Mass

41.962402 u

Abundance

—

Half-life

12.355 h

Spin/Parity

2-

Decay Mode(s)

β⁻ (100%)

⁴³K

Mass

42.960735 u

Abundance

—

Half-life

22.3 h

Spin/Parity

3/2+

Decay Mode(s)

β⁻ (100%)

⁴⁴K

Mass

43.961587 u

Abundance

—

Half-life

22.13 m

Spin/Parity

2-

Decay Mode(s)

β⁻ (100%)

⁴⁵K

Mass

44.960691 u

Abundance

—

Half-life

17.81 m

Spin/Parity

3/2+

Decay Mode(s)

β⁻ (100%)

⁴⁶K

Mass

45.961982 u

Abundance

—

Half-life

105 seconds

Spin/Parity

(2-)

Decay Mode(s)

β⁻ (100%)

⁴⁷K

Mass

46.961662 u

Abundance

—

Half-life

17.50 seconds

Spin/Parity

1/2+

Decay Mode(s)

β⁻ (100%)

⁴⁸K

Mass

47.965341 u

Abundance

—

Half-life

6.8 seconds

Spin/Parity

1(-)

Decay Mode(s)

β⁻ (100%), β⁻n (1.14%)

⁴⁹K

Mass

48.968211 u

Abundance

—

Half-life

1.26 seconds

Spin/Parity

(1/2+ 3/2+)

Decay Mode(s)

β⁻ (100%), β⁻n (86%)

⁵⁰K

Mass

49.972380 u

Abundance

—

Half-life

472 milliseconds

Spin/Parity

0(-)

Decay Mode(s)

β⁻ (100%), β⁻n (29%)

⁵¹K

Mass

50.975829 u

Abundance

—

Half-life

365 milliseconds

Spin/Parity

3/2+

Decay Mode(s)

β⁻ (100%), β⁻n (65%)

⁵²K

Mass

51.981602 u

Abundance

—

Half-life

110 milliseconds

Spin/Parity

(2-)

Decay Mode(s)

β⁻ (100%), β⁻n (74%), β⁻2n (2.3%)

⁵³K

Mass

52.986800 u

Abundance

—

Half-life

30 milliseconds

Spin/Parity

(3/2+)

Decay Mode(s)

β⁻ (100%), β⁻n (67%), β⁻2n (17%)

⁵⁴K

Mass

53.994471 u

Abundance

—

Half-life

10 milliseconds

Spin/Parity

2-

Decay Mode(s)

β⁻ (100%)

⁵⁵K

Mass

55.000505 u

Abundance

—

Half-life

Unknown

Spin/Parity

(3/2+)

Decay Mode(s)

β⁻ (100%)

⁵⁶K

Mass

56.008567 u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

β⁻ (100%)

Decay mode abbreviations:

β⁻ = Beta minus decay, β⁺ = Beta plus decay, EC = Electron capture, α = Alpha decay

n = Neutron emission, p = Proton emission, SF = Spontaneous fission, IT = Isomeric transition

Conversions Print

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2

3

4

5

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7

8

9

10

11

12

13

14

15

16

17

18

1

2

3

4

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7

N

Sy

Name

Atomic Mass

Series

Metals

Nonmetals