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Question

The atomic number of magnesium is 12, it will achieve its stable electronic configuration by donating _______ number of electrons.


A

6

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B

5

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C

4

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D

2

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Solution

The correct option is D

2


The explanation for the correct option (D):

Octet rule: The octet rule states that every atom to attain stability must be filled with " 8 " electrons in its outermost electron shell.

  • As the number of electrons in the outer shell of the most stable or inert atoms is 8.

Magnesium(Mg): The atomic number of Magnesium(Mg) is12, So there are 12 electrons and its electronic configuration is 2(K),8(L),2(M).

  • Here, the M shell will be its valence shell with 2 electrons.
  • It will achieve its stable electronic configuration like Neon(Ne) 10: 2(K),8(L) by donating these two valence electrons.

Thus, option (D) i.e., 2 is the correct option.


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