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An atom of Magnesium loses 2 electrons. The resulting Mg²⁺ ion has the same electron configuration as which noble gas?
AHelium (He)
BNeon (Ne)
CKrypton (Kr)
DArgon (Ar)
Answer & Solution
Correct answer: B. Neon (Ne)
Magnesium (Z=12) configuration: 2, 8, 2. Losing both M-shell electrons gives Mg²⁺ with configuration 2, 8 — exactly the configuration of neon (Z=10). Many ions achieve noble-gas configurations by gaining/losing electrons; this is why neon's configuration shows up in Na⁺, Mg²⁺, Al³⁺, F⁻, O²⁻, etc.
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