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...Chapter ions ionic compounds and nomenclature an ion is a small particle having electrical charge are either single charged atoms simple or molecules polyatomic examples of na ca cl s nh co oh positively called cations pronounced cat eye ons while negatively anions in many cases the elements position on periodic table will help you determine kind formed anion cation size look at periodictable pdf equivalent starting with boron atomic number continuing downwards to right astatine there bold staircase shaped red line left this metals commonly form non some adjacent metalloids but distinction doesn t us so don concern yourself it we see groups labeled i ii iii b newer versions numbered use older version show new group numbers parenthesis any particular tend characteristic charges please note capable range therefore different through transition these varying amounts common from can be found no way accurately predicting for that first element metal typically iv although tin sn lead pb gener...