An ion that consists of 7 proton,7 neutrons and 10 electrons has a net charge of ? A 3+
B 4+
C 4-
D 3-​

C. 3-

Explanation:

Protons have an individual charge of 1+, neutrons have no individual charge, and electrons have an individual charge of 1-.

So the total charge from protons is 7+ and electrons 10-, which gives a net charge of 3-.

your mom.com . : 0000

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)