What is the correct answer?

Which of the following units is not an official si unit? mole liter kilogram ampere

Describe the magnitude of the buoyant force

Acertain atom has 22 protons and 19 electrons. this atom loses an electron. the net charge on the atom is now 4+1+01-4-. if this same atom with 22 protons and 19 electrons were to gain 3 electrons, the net charge on the atom would be 3+2+02-3-.