Question

4. Changing the number of electrons changes the _____ of the atom, which is then called an _____.

Answer 1

Changing the number of electrons changes the net electric charge of the atom.

If the atom was originally neutral, then it becomes an ion .  (If it wasn't originally neutral, then it was already an ion.)

Answer 2

Answer:

Changing the number of  electrons changes the charge of an element and creates an ion.