2. __o_
a substance that contains useful
chemical energy
use the clues to fill the missing letters

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Arectangle has a diagonal 20 inches long that forms angles of 60 and 30 with the sides. find the perimeter of the rectangle. for geometry

If it is an isoelectronic series select true, if not select false. o2-, s2-, se2-, te2- na+, k+, rb+, cs+ n3-, p3-, as3-, sb3- ag, cd+, sn3+, sb4+ f-, cl-, br-, i- f-, ne, na+, mg2+ s2-, s, s6+