1) Hydrogen, Lithium, Sodium, Potassium, Rubidium, Cesium, Francium
2) The number of valence electrons increases by one as you move from left to right across a row.
3) The number of energy levels or shells increases by one as you move down a group or column.
4) families
5) inert
6) Radium - Alkaline Earth Metals, Tin - Post-Transition Metals, Iodine - Halogens, Cesium - Alkali Metals
7) Barium = 2, Lead = 4, Bismuth = 5, Potassium = 1
8) Melting points generally decrease as you move from left to right across a period, with some exceptions.
Parent Tip: Review the logic above to help your child master the concept of periodic table worksheet answers key.
