Question

If elements x has 54 protons how many electrons does it have

Answer 1

The amount of electrons would be 8
The amount of protons of an element cannot change or it would be a different element. You have to look at a periodic table and find element 54. It is Xe which is a noble gas and is in group 18 which all has 8 electrons

Answer 2

The same amount the only thing that shall differ is the neutrons.