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A scientist studying reactions of metals...

A scientist studying reactions of metals and non-metals. He knew group 1 and 2 elements are metals while group 17 elements are non-metals. So, he chooses different elements from group 1 and 2 and group17
Name the element in group 17 which forms a diatomic molecule and exists in solid state at room temperature .

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CHETANA PUBLICATION-Periodic Classifications of ELements-EXAMPLE
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