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The classification with 1A, 7A etc. is not recommended by IUPAC and is obsolete.
The 1A elements are alkali metals, all solids; the 7A elements are the nonmetals (halogens). Halogens can be gaseous, liquids or solids at room temperature.

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9y ago
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Q: What are the two main differences in 1A and 7A elements?
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