Question

Which of the following represents the correct electron distribution in magnesium ion? (a) 2, 8
(b) 2, 8, 1
(c) 2, 8, 2
(d) 2, 8, 3

Answer 1

Explanation:

c. 2, 8, 2.

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Answer 2

Magnesium ion possesses ten electrons, so its configuration is 2,8.

Explanation:

• The atomic number of Magnesium is 12. So, to satisfy the octet configuration or the noble gas configuration, it loses 2 of its electrons.
• So, now it has 10 electrons which is similar to the element neon having an atomic number of 10.
• Therefore, the magnesium ion, Mg2+ has 10 electrons. And to satisfy the noble gas configuration, the electronic configuration becomes: 2, 8 i.e., $Mg^2^+: 1s^2 2s^2 2p^6.$