Question

What isotope has 18 protons and 22 neutrons?

Answer 1

This a neutral atom of `Argon`.

Explanation:

Always remember that the number of protons represent the Atomic no. of that particular element.

In this case the number of protons is `18`,So,the atomic no. is also `18`.

And the element with atomic no. `18` is `Argon` with symbol `Ar`

Now we need to find the mass number of `Argon` .
Because `Mass` `n` `umber-At` `omic` `n` `umber` `=` `N` `o` `of` `n` `eutrons`

Mass number of Argon=`40`

No of Neutrons`=40-18=22`

A neutral atom of argon also has `22` Neutrons.

So,It is clear that this is not an isotope but a neutral atom of `Argon`