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Question

Magnesium with atomic number 12 attains the stable electronic configuration of the nearest noble gas :

A
Neon
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B
Xenon
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C
Helium
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D
Argon
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Solution

The correct option is A Neon
Magnesium with atomic number 12 and electronic configuration 2(K), 8(L), 2(M). Therefore, it has two electrons in its valence shell. It donates two electrons from its M shell to attain the stable electronic configuration of the nearest noble gas neon. Thus, the magnesium ion has two positive charges.

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