What do the total charges need to add to in order to write an ionic formula?

Explanation:

When metal and nonmetal ions form ionic bonds, their total electrical charges must balance each other exactly (as in, add up to zero). In order to write a correct formula, you must know the ion charges of all the atoms involved.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.