What happens when you decrease the number of electrons in an atom?

When the number of electrons are decreased the atom becomes positively charged due to the uneven number of protons and electrons,
in general let P represents protons and E represent electrons
when P< E (the atom is negative)
when P>E (the atom is positive)

The nucleus inside an atom consists of positively-charged  protons  and neutrally-charged  neutrons. a  proton  is a subatomic particle with a positive electric charge. allprotons  are identical.

Particle exchange energy though elastic collision , hope this .