Question

In which atomic number electronic configuration subject having?

Answer 1

What you are asking according to this question?

Answer 2

This is the electron configuration of Potassium K # 19 

There are 2 electrons in the first shell

There are 8 electrons in the second shell

There are 8 electrons in the third shell 

leaving only 1 electron in the fourth and valence shell.

This results in ionized potassium almost always having a charge of K+:

K→K++e−

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