Out of the following, which has the least amount of mass? a) protons b) none of the above c) electrons d) neutrons

Can someone me with questions 12 and 13 plz.

Using the first volume and temperature reading on the table as v1 and t1, solve for the unknown values in the table below. remember to use the rules of significant figures when entering your numeric response.

The atom fluorine generally will become stable through the formation of an ionic chemical compound by accepting electron(s) from another atom. this process will fill its outer energy level of electrons.