Question

to change ca to ca+2, you need to: remove 2 electrons add 2 protons remove 2 protons add 2 electrons

Explanation:

An atom becomes a positively - charged ion by losing electrons. Calcium (Ca) has a neutral charge. To form a Ca²⁺ ion, it needs to lose 2 electrons as electrons are negatively charged. Losing 2 electrons results in a net positive charge of +2. Adding or removing protons would change the element itself, not just its charge state. Adding electrons would make the atom negatively charged.

Answer:

remove 2 electrons