Question

which of the following groups of periodic table does an element belong if it has an atomic number of 10[a] 1 [b] 2 [c] 18 [d] 17

Answer 1

Answer:

In the group 17,element in period three has atomic no-2,8,7=17

" " " " fourth " -2,8,18,7=35

" " " " fifth " " -2,8,18,18,7=53