Atom – the smallest unit of matter “indivisible” Helium atom.
Groups - Review Each column is called a “group” Each element in a group has the same number of electrons in their outer orbital, also known as “shells”.
LecturePLUS Timberlake1 Chapter 4 Compounds and Their Bonds 4.1 Valence Electrons 4.2 Octet Rule and Ions.
