How many sodium ions are in 58.5 grams of sodium chloride?

Which element would mostly likely have an electron affinity measuring closest to zero

Animals that reproduce sexually either do it through external or internal fertilization. read the following statement and decide if it is true or false. birds reproduce through external reproduction which is because the female will then be able to protect the egg.

Anitrogen atom and an oxygen atom combine chemically to form nitric oxide. what is nitric oxide?