What subatomic particle is directly related to the atomic number?

Suppose you got a low yield of benzoin from your benzoin condensation reaction and thus only have 0.300 g of benzoin to use as the starting material for this reaction. how much concentrated nitric acid should you add? (concentrated nitric acid is 15.8 m). write your answer in the form x.xx ml

Which other elements contain the same number of outer electrons as sodium

What are the similarities of physical and chemical change ?