3 Group 4 5 7 Periodic Table of the Elements C 12. Each period number is actually the number of shells of electrons that can exist in that atom. Source: CRC Handbook of Chemistry and Physics, 91st ed., 20102011, CRC Press.This helps us decide if we will lose or gain electrons and what the potential charge might be.Each group number is actually the number of valence electrons in the last shell of electrons.What do the group numbers and period numbers tell us? Smaller atoms have an easier time gaining an electron to fill the valence shell, higher scaled score Electronegativity increasesĮlectronegativity F O N EN C B Be Li Atomic Number.Larger atoms have a more difficult time gaining an electron to fill the valence shell, lower scaled score.Scaled from 0-4 describes how badly an atom wants to gain an electron to fill its valence shell.Ionization Energies (IE) He Ne N F 1st IE (kJ/mol) H O Be C B Li Atomic Number Lesson Plan: Periodic Table Types of Elements and Properties- 12 HS Regents Chemistry Teaching & Homework Resources w/ Answers Vintage Reviews and Examinations. Smaller atoms require more energy to remove an electron from the valence shell 1st IE Increases. ![]()
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