Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test Chemistry Classification of Elements and Periodicity in Properties Periodic Table
Electronic configurations of four elements A, B, C and D are given below :
(A) 1s2 2s2 2p6
(B) 1s2 2s2 2p4
(C) 1s2 2s2 2p6 3s1
(D) 1s2 2s2 2p5
Which of the following is the correct order of increasing tendency to gain electron :
1
A < C < B < D
2
A < B < C < D
3
D < B < C < A
4
More than one of the above
5
None of the above