Out of the elements with atomic numbers given below which one would be a halogen?

25

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35

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45

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55

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Solution

The correct option is B $35$
Noble gases are:
$H e (2)$
$N e (10)$
$A r (18)$
$X e (36)$
Halogens should be just one less than noble gas atomic number.
So, 1, 9, 17, 35 represent halogens.

Suggest Corrections

Age	20−25	25−30	30−35	35−40	40−45	45−50	50−55	55−60
Number of Students	50	70	100	180	150	120	70	60