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Number of Elements in a Period

Find the bloc...

Question

Find the block to which Magnesium, the atomic number is 12, belong.

A

s

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B

p

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C

d

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D

f

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Solution

The correct option is A s
The atomic number of magnesium is 12. The electronic configuration of magnesium atom is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}$ . The orbital occupied by the ultimate electron is 's'. Hence magnesium belongs to 's' block.

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