If you know the number of protons what else do you know the number of?

If you know the number of protons you also know the number of electrons because an element has the same number of electrons as it does protons.

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)

Igonna be honest i dunno that one srry