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b. 2 8 7 elektron valensi = 7
c. 2 8 8 2 elektron valensi =2
₁₇Cl = 1s² 2s² 2p⁶ 3s² 3p⁵ = [Ne]3s² 3p⁵ (Elek. val = 7)
₂₀Ca = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² = [Ar]4s² (Elek. Val = 2)