Changing the number of protons in an atom makes

a. an ion
b. an isotope

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

What are the advantages of using the metric system? designed as a decimal system making conversions simpler more accurate system of measurement has prefixes that correspond to an amount to use with all base units used by the entire scientific community