The element with atomic number 12 belongs to ......... group and ......... period
The element with atomic number 12 belongs to ......... group and ......... period
LA, third
III A, third
II A, third
II A, second
Solution
Electronic configuration of $Z=12$ is
$1 s^2, 2 s^2, 2 p^4, 3 s^2$
Number of electrons in least orbit $=2$ i.e., group $=$ II A
Valence shell is 3 rd shell, so period $=3$ period