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Question

Elements with atomic numbers 9, 17, 35, 53 are collectively known as:

A
chalcogens
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B
halogens
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C
lanthanides
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D
rare gases
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Solution

The correct option is B halogens
Elements having the atomic number:

9 is fluorine: (He)2s22p5
17 is chlorine: (Ne)3s23p5
35 is bromine: (Ar)4s24p5
53 is iodine: (Kr)5s25p5

We can observe here that all these elements having the general electronic configuration of ns2np5, hence these elements belong to 17th group elements.

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