Z=3 1s2 express answer as an ion

The element with electronic configuartion 1s² and atomic number 3 must be an cation.

Explanation:

The "Z" shows the atomic number. Z stand for zahl. It Is German word and meaning is " number".

In given question Z is equal to three which means an element with atomic number three.

Let consider the X is an element with atomic number three having electronic configuration 1s², but according to this atomic number there should be one more electron present is 2s. If X has the electronic configuration 1s² it means that it lose one electron and X is present in the form of cation.

X⁺ = 1s²