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Cl = 2 8 7 = Cl-
=> ikatan ionik
b.) Mg = 2 8 2 = Mg2+
Cl = 2 8 7 = Cl-
=> ikatan ionik
₁₁Na = 2,8,1 membentuk Na⁺
₁₇Cl = 2,8,7 membentuk Cl⁻
Na⁺ + Cl⁻ ⇒ NaCl
b)
₁₂Mg = 2,8,2 membentuk Mg²⁺
₇Cl = 2,8,7 membentuk Cl⁻
Mg²⁺ + 2Cl⁻ ⇒ MgCl₂