Question

What is the electronic configuration of Pm3+?

Answer 1

Pm stands for Promethium ,which is an inner transition metal. it's electron configuration is (ex) 4f4

Answer 2

Answer: $Pm^{3+}:59:[Xe]4f^4$

Explanation:-

Promethium is an element with atomic number 61 and thus contain 61 electrons. It is a f block element as the last electron enters the f orbital. The nearest noble gas is Xenon with 54 electrons.

The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration in terms of noble gs configuration is:

$Pm:61:[Xe]4f^56s^2$

$Pm^{3+}$ is formed when 3 electrons are removed from the outermost shell and the configuration is:

$Pm^{3+}:58:[Xe]4f^4$