Uranium

ACTINOID · GROUP None · PERIOD 7

Uranium

238.03

Atomic Data

[Rn] 5f³ 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	3	81
P	6	6s	2	83
P	6	6p	6	89
P	6	6d	1	90
Q	7	7s	2	92
Total			92	92

Uranium has three naturally occurring stable isotopes. The most abundant is ²³⁸U, comprising 99.2742% of all naturally occurring Uranium.

Isotope	Symbol	Protons	Neutrons	Abundance	Stability
Uranium-234	²³⁴U	92	142	0.0054	Stable
Uranium-235	²³⁵U	92	143	0.7204	Stable
Uranium-238	²³⁸U	92	146	99.2742	Stable

Uranium is present in Earth's crust at approximately 2.7 ppm by mass and at approximately 0.009 ppm by mass throughout the universe.

Uranium

2.7 ppm

Silicon (ref.)

277,000 ppm

Oxygen (ref.)

461,000 ppm

Uranium

0.009 ppm

Helium (ref.)

230,000 ppm

Hydrogen (ref.)

739,000 ppm

Free periodic table reference sheets for classrooms, study sessions, and laboratory use.

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