Actinium

Actinoid

Head of actinoids; intensely radioactive (glows blue).

Electronic Configuration

[Rn] 6d¹ 7s²or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 6d¹ 7s²

Electron shells

2e⁻

n=1

8e⁻

n=2

18e⁻

n=3

32e⁻

n=4

18e⁻

n=5

9e⁻

n=6

2e⁻

n=7

Atomic number

Atomic mass

227 u

Actinoid

Head of actinoids; intensely radioactive (glows blue).

Electronic Configuration

[Rn] 6d¹ 7s²or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 6d¹ 7s²

2e⁻

n=1

8e⁻

n=2

18e⁻

n=3

32e⁻

n=4

18e⁻

n=5

9e⁻

n=6

2e⁻

n=7

Atomic number

Atomic mass

227 u