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Electronic Configuration of Halogens

An element be...

Question

An element belongs to group 17 it is present in third period and its atomic number is 17 What is the atomic number of the element belonging to same group and present in fifth period ?

A

25

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B

33

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C

35

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D

53

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Solution

The correct option is D 53
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

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