Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question
Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
MCQ
Electronic configuration of magnesium is :
✓
$2, 8, 2$
B
$2, 8, 1$
C
$2, 8, 7$
D
$2, 1$
✓
Answer
Correct option: A.
$2, 8, 2$
Magnesium has atomic number $12$. It will be distributed in $\ce{K, L, M}$ shell in the following way:
$K$ shell can accommodate a maximum of $2$ electrons.
$L$ shell can accommodate a maximum of $8$ electrons and $M$ shell will accommodate $2$ electrons.
So the configuration becomes $2, 8, 2.$
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