1st Period: Hydrogen and helium—Electrons go into the first energy level. After the first level has two electrons, the next electron goes into the second level. 2nd Period: Lithium to neon—Electrons ...

A small piece of sodium metal is placed in a flask of chlorine gas. A little water helps expose the sodium so it can react with the chlorine gas. The reaction releases a lot of heat as the ionic ...

Like carbon, silicon has four electrons in its outermost electron shell, so it can ... The band gap is the energy difference between the highest energy level or "top" of the valence band (that ...