The fact that water boils at 100° C is an example of a(n) intensive physical property, chemical property, extensive physical property, chemical change, physical change HELP I GOTTA GET IT FAST PLZ

In chemistry, the type of an atom (what element it is) is determined by: a) the number of protons it contains in its nucleus. b) the number of neutrons it contains in its nucleus. c) the number of protons it has in a cloud around the nucleus. d) the number of neutrons it has in a cloud around the nucleus. e) the number of electrons it exchanges with its neighbors.