A period specifics what about an element •total number of energy

•How reactive the element is

• total number of valence electrons

• The total number of neutrons in the nucleus

use smarts app it gives all theanswers

i would say it is

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.