Achemical compound once used as a propellant in aerosol sprays is called

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Chemistry worksheet - i am not sure what they are asking for exactly?

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2