Question

The elements with atomic numbers 9, 17, 35, 53 and 85 belong to noble gases columnz__________.

• A. True
• B. False

Answer 1

The correct option is B False

The atomic number of elements are 9,17,35,53,85.
Electronic configuration of elements will be
9 = 2,7
17= 2,8,7
35= 2,8,18,7
53=2,8,18,18,7
85=2,8,18,18,32,7
The pattern shows that all elements have 7 electron in their outermost valence shell and all these elements belong to halogens.