Question

what is the charge of a cation?
a negative charge
the charge depends on the size of the nucleus.
a positive charge
no charge

Explanation:

A cation is formed when an atom loses electrons. Since electrons are negatively - charged particles, losing them results in the atom having more protons (positively - charged particles) than electrons. So, a cation has a positive charge. The charge of a cation is not related to the size of the nucleus. Atoms (neutral) have no net charge, and anions (negatively - charged ions) have a negative charge.

Answer:

C. a positive charge