The elements with atomic numbers 35, 53 and 85 are all ________ .

noble gases

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halogens

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heavy metals

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light metals

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Solution

The correct option is B halogens
Electronic configuration of elements will be
$35 = 2, 8, 18, 7$
$53 = 2, 8, 18, 18, 7$
$85 = 2, 8, 18, 18, 32, 7$
The pattern shows that all elements have $7$ electron in their outermost valence shell and all these elements belong to halogens family.
Hence, option B is correct.

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9, 17, 35, 53, 85

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