How many valence electrons does promethium have?

Answer 1

Promethium has nine isotopes, their numbers ranging from 143 to 151. None of the isotopes are naturally occurring, yet some stars have minute amounts of promethium.

Answer 2

It has 84 neutrons

61 electrons

and 61 protons

Answer 3

Promethium has 61 protons and electrons.
For each isotope the number of neutrons is different. Number of neutrons = Mass number of an isotope - 61

Answer 4

Promethium has 61 protons.

Answer 5

Promethium has six electron shells.

Answer 6

+3

Answer 7

6