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GK QUESTION#3288

For the common halogens fluorine, chlorine, bromine and iodine, identify the INCORRECT statement about their periodic-table group.

  1. AThey have the largest atomic size in their period.Correct answer
  2. BThey are reactive non-metals.
  3. CThey form diatomic molecules in their elemental states.
  4. DThey are located on the left of the noble gases on the periodic table.
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Answer

A. They have the largest atomic size in their period.

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Explanation

For fluorine through iodine, the listed halogens are reactive non-metals and their elemental molecular forms are F₂, Cl₂, Br₂ and I₂. Group 17 lies immediately to the left of Group 18. Atomic size generally decreases across a period, so claiming that these halogens have the largest atoms in their periods is incorrect.

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