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Q.

The element with the atomic number 12 belongs to __group and _period.

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a

IIA, second

b

IIIA, second

c

IA, third

d

IIIA, third

answer is C.

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Detailed Solution

With an atomic number of 12, magnesium is the element.
Mg has the following electronic configuration: $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} .$
It belongs to the IIA group since the outermost shell contains 2 electrons. Since Mg has a third outer shell, the period is three.
So, C is the best choice.

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The element with the atomic number 12 belongs to ______group and _____period.