Question

A stable neutral atom of an element contains three
fully filled orbits. Find the atomic number of the
element.
Dont copy paste from the internet, i didnt understand that, pls explain...

Answer 1

Answer:

Stable means balanced.

neutral atom means which contain equal/same number of protons and electrons

Orbits means outer revolving shells.

Atomic number means number of electrons.

So the question says tell an element whose 3 shells(orbits) are filled (stabled) and tell its atomic number.

So Argon (Ar) is an element whose K,L,M these three orbits are fully filled.

And it's atomic number is 18 (2,8,8)