How is a pure substance different from a mixture? A. Pure substances are separated by physical means B. Mixtures cannot be separated by physical means C. A pure substance is heterogeneous D. Mixtures are made up of more than one component.

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-.