Question

What is the number of protons, neutrons, and electrons in `""_18^40Ar`?

Answer 1

`18` protons, `18` electrons, and `22` neutrons.

Explanation:

In the form of an element, `""_Z^YX`, `Z` is the number of protons, and also the number of electrons, and `Y` is the atomic mass.

So, in the case of `""_18^40Ar`, then it has `18` protons and `18` electrons.

The number of neutrons is given by subtracting the atomic mass from the proton number. So here, `Y=40`, and the number of neutrons is:

`Y-Z`

`=40-18`

`=22`