I have no idea i am so sorry
B
Solar energy does not give off toxic wastes as nuclear energy does (ex. Chernobyl)
As you know, an element'svalence electrons are simply theelectrons located on the outermost energy level, i.e. on thehighest occupied energy level. Therefore, you can say that anelement located in group 5A has 5 electrons on its highest occupied energy level. so the answer would be c.5
