Protactinium

ACTINOID · GROUP None · PERIOD 7

Protactinium

231.04

Atomic Data

[Rn] 5f² 6d¹ 7s²

Shell	n	Subshell	Electrons	Cumulative
K	1	1s	2	2
L	2	2s	2	4
L	2	2p	6	10
M	3	3s	2	12
M	3	3p	6	18
M	3	3d	10	28
N	4	4s	2	30
N	4	4p	6	36
N	4	4d	10	46
N	4	4f	14	60
O	5	5s	2	62
O	5	5p	6	68
O	5	5d	10	78
O	5	5f	2	80
P	6	6s	2	82
P	6	6p	6	88
P	6	6d	1	89
Q	7	7s	2	91
Total			91	91

Protactinium is monoisotopic — ²³¹Pa is its only naturally occurring stable isotope, accounting for 100% of all natural Protactinium.

Isotope	Symbol	Protons	Neutrons	Abundance	Stability
Protactinium-231	²³¹Pa	91	140	trace	Stable

Protactinium is present in Earth's crust at approximately trace amounts by mass and at approximately trace amounts by mass throughout the universe.

Protactinium

None ppm

Silicon (ref.)

277,000 ppm

Oxygen (ref.)

461,000 ppm

Protactinium

None ppm

Helium (ref.)

230,000 ppm

Hydrogen (ref.)

739,000 ppm

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