Radium

ALKALINE-EARTH METAL · GROUP 2 · PERIOD 7

Radium

226

Atomic Data

[Rn] 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
P	6	6s	2	80
P	6	6p	6	86
Q	7	7s	2	88
Total			88	88

Radium has two naturally occurring stable isotopes. The most abundant is ²²⁶Ra, comprising None% of all naturally occurring Radium.

Isotope	Symbol	Protons	Neutrons	Abundance	Stability
Radium-226	²²⁶Ra	88	138	trace	Stable
Radium-228	²²⁸Ra	88	140	trace	Stable

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

Radium

None ppm

Silicon (ref.)

277,000 ppm

Oxygen (ref.)

461,000 ppm

Radium

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