Need answering these questions really need the answers 1. what determines if an atom will form a bond? a the protons in the nucleusb the electrons in the valence shellc the protons+ electronsd the number of neutrons2. which two groups of macromolecules are most commonly used as a source of energy? a proteins and nucleic acidsb lipids and carbohydratesc carbohydrates and nucleic acidsd lipids and proteins