alleryStart learning →Magnesium (Z = 12) forms Mg^2+ by losing how many electrons?
ATwo
BOne
CThree
DFour
Answer & Solution
Correct answer: A. Two
1. Magnesium has electronic configuration 2, 8, 2.
2. It loses its two valence electrons to attain the neon configuration 2, 8.
3. Loss of 2 electrons gives a 2+ charge.
4. So Mg^2+ forms by losing two electrons.
_Source: Selina Concise Chemistry ICSE Class 9, Ch 4 'Atomic Structure'_
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