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e- valensi : 4, kulit terluar : 3 jadi golongan IVA ( golongan c) periode 3
fosfor = 1s^2 2s^2 2p^6 3s^2 3p^3
e-valensi : 5, kulit terluar : 3 jadi golongan VA (golongan n) periode 3