Helium H Neon Ar These elements are all in the last column of the Periodic Table Hydrogen H Lithium LI Sodium Na These elements are all in the first column of the Periodic Table The number of valence electrons increases from 1 to 8 The number of energy levels increases from 1 to 3 Alkali Metals - 1 valence electron Lithium Li & Sodium Na Alkaline Earth Metals - 2 valence electron Calcium Ca & Magnesium Mg Boron Family - 3 valence electron Boron B & Aluminum Al Carbon Family - 4 valence electron Carbon C & Silicon Si Nitrogen Family - 5 valence electron Nitrogen N & Phosphorus P Oxygen Family - 6 valence electron Oxygen O & Sulfur S Halides - 7 valence electron Fluorine F & Chlorine Cl Noble Gases - Complete outermost shell Helium H, Neon Ne & Argon Ar The families line up in columns on the Periodic Table Hydrogen could be classified as an Alkali Metal because it has 1 valence electron and is in the first column. It could be classified as one of the Halides as it only needs one electron to have its outer shell filled. Barium = 2 Lead = 4 Xenon = 8 Potassium = 1
Helium H Neon Ar These elements are all in the last column of the Periodic Table Hydrogen H Lithium LI Sodium Na These elements are all in the first column of the Periodic Table The number of valence electrons increases from 1 to 8 The number of energy levels increases from 1 to 3 Alkali Metals - 1 valence electron Lithium Li & Sodium Na Alkaline Earth Metals - 2 valence electron Calcium Ca & Magnesium Mg Boron Family - 3 valence electron Boron B & Aluminum Al Carbon Family - 4 valence electron Carbon C & Silicon Si Nitrogen Family - 5 valence electron Nitrogen N & Phosphorus P Oxygen Family - 6 valence electron Oxygen O & Sulfur S Halides - 7 valence electron Fluorine F & Chlorine Cl Noble Gases - Complete outermost shell Helium H, Neon Ne & Argon Ar The families line up in columns on the Periodic Table Hydrogen could be classified as an Alkali Metal because it has 1 valence electron and is in the first column. It could be classified as one of the Halides as it only needs one electron to have its outer shell filled. Barium = 2 Lead = 4 Xenon = 8 Potassium = 1
periodic_table_basics_-_answers.docx