Question

What is the electronic configuration of an element with an atomic number $19$?

Answer 1

The arrangement of electrons of a molecule or atom in a molecular orbital or an atomic orbital is known as electronic configuration and each electron is moving independently in an orbital.

Complete step by step answer:
We must need to know that the electronic configuration of an element with atomic number $19$ is, $1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}4{s^1}$ or it can also be written as, $\left[ {Ar} \right]4{s^1}$ or $2,8,8,1$ and the element is potassium.
We must have to know the atomic number $19$ implies that the total number of electrons present in the element is $19$. As we know that the potassium is an alkali metal which is having the valency one. The alkali metal, potassium is converted into metal at a high-pressure condition. We also remember that the potassium is a silvery-white color metal and it readily reacts with atmospheric oxygen and there is a formation of potassium peroxide. And the potassium helps the functions of muscles and nerves to contract.

Note: The electrons are known to move from one configuration to another configuration under conditions such as formations of bond. The atomic number, having an electronic configuration $1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}4{s^1}$ or $\left[ {Ar} \right]4{s^1}$, is the element potassium with the symbol 'K'. And the number of potassium valencies is equal to one.