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Correct Answer: A) Si⁴⁺
Si⁴⁺ has 10 electrons: 1s² 2s² 2p⁶ So it has no 3p electrons. S²⁻, Cl⁻ and K⁺ each have 18 electrons: [Ar] = 3p⁶ Therefore, Si⁴⁺ is different.