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

1. chalcogens
2. halogens
3. lanthanides
4. rare gases

Correct answer: halogens

Solution

Atomic numbers 9, 17, 35, and 53 correspond to fluorine, chlorine, bromine, and iodine. These are Group 17 elements, collectively called the halogens.

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