Americium

ACTINOID · GROUP None · PERIOD 7

Americium

243

Atomic Data

[Rn] 5f⁷ 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	7	85
P	6	6s	2	87
P	6	6p	6	93
Q	7	7s	2	95
Total			95	95

Americium has two naturally occurring stable isotopes. The most abundant is ²⁴¹Am, comprising None% of all naturally occurring Americium.

Isotope	Symbol	Protons	Neutrons	Abundance	Stability
Americium-241	²⁴¹Am	95	146	trace	Stable
Americium-243	²⁴³Am	95	148	trace	Stable

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

Americium

None ppm

Silicon (ref.)

277,000 ppm

Oxygen (ref.)

461,000 ppm

Americium

None ppm

Helium (ref.)

230,000 ppm

Hydrogen (ref.)

739,000 ppm

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

Colour PDF Black & White PDF