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...Topic valence electrons and ionic compounds enduring understanding spq the periodic table shows patterns in electronic structure trends atomic properties learning objective b explain relationship between reactivity of elements periodicity essential knowledge likelihood that two will form a chemical bond is determined by interactions nuclei same column tend to analogous typical charges atoms are governed their location on number equation s n notes an always involves transfer from least electronegative species most traditionally described as being metal nonmetal based electron configuration either lose or gain order have complete p outer shell this loss leads formation positive negative ions held together electrostatic force maintain neutrality lost must equal gained because configurations group mnm for example all i metals lithium cesium following format when combined with any vii halogen fluorine astatine lif licl ii would be caf mgcl again these structures need nonmetals only want eno...