Praseodymium

LANTHANOID · GROUP None · PERIOD 6

Praseodymium

140.91

Atomic Data

[Xe] 4f³ 6s²

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	3	49
O	5	5s	2	51
O	5	5p	6	57
P	6	6s	2	59
Total			59	59

Praseodymium is monoisotopic — ¹⁴¹Pr is its only naturally occurring stable isotope, accounting for 100% of all natural Praseodymium.

Isotope	Symbol	Protons	Neutrons	Abundance	Stability
Praseodymium-141	¹⁴¹Pr	59	82	100	Stable

Praseodymium is present in Earth's crust at approximately 9.2 ppm by mass and at approximately 0.9 ppm by mass throughout the universe.

Praseodymium

9.2 ppm

Silicon (ref.)

277,000 ppm

Oxygen (ref.)

461,000 ppm

Praseodymium

0.9 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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