Question

2. The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 which elements belong to the same group?

a) And B

b) B and D

c) A and C

d) D and E​

Answer 1

Answer:

D and E option D okay Bye please Make me Brilliant

Answer 2

Answer : c) A and C

Because A and C have same valency or same number of valence electrons.

A's configuration = 2,7       C 's configuration = 2,8,7  

Both have 7 valence electrons so belongs to the dame group