1.

If the mass number of an atom is \[A=40\] and its electron configuration is \[1{{s}^{2}},\ 2{{s}^{2}},\ 2{{p}^{6}},\ 3{{s}^{2}},\ 3{{p}^{6}}\], the number of neutrons and protons in its nucleus will be  [RPMT 2002]

A.            22, 18                                      
B.            18, 22
C.            20, 20                                       
D.            18, 18
Answer» B.            18, 22


Discussion

No Comment Found

Related MCQs