A) II A group and 5th period
B) II A group and 2nd period
C) V A group and 2nd period
D) III A group and 5th period
Correct Answer: A
Solution :
The electronic configuration of atomic number 38 is \[X\text{(}38\text{)}:\text{ }I{{s}^{2}},\text{ }2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}},\text{ }4{{s}^{2}}3{{d}^{10}}4{{p}^{6}},\text{ 5}{{s}^{2}}\]or \[1{{s}^{2}},\text{ }2{{s}^{2}},\text{ }2{{p}^{6}},\text{ }3{{s}^{2}},\text{ }3{{p}^{6}}3{{d}^{10}},\text{ }4{{s}^{2}}4{{p}^{6}},\text{ }5{{s}^{2}}\] Hence, it is belongs to II A group and 5th period. It is strontium (Sr).
You need to login to perform this action.
You will be redirected in
3 sec
