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Standard XII
Chemistry
Periods
Identify the ...
Question
Identify the group and period of the element with atomic number 12.
A
IA, third
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B
IIIA, third
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C
IIA, third
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D
IIA, second
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Solution
The correct option is
B
IIA, third
The electronic configuration of the element with atomic number 12 is
1
s
2
2
s
2
2
p
6
3
s
2
.
The number of valence electrons
=
2
, which means it belongs to group II A.
The valence shell is 3, which means it belongs to the third period.
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