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Answer:

groups

Li=1A.... Be=2A...B=3A....C=4A...N=5A....O=6A....F=7A.....Ne=8A

Period

they all BELONG to second period.

metals: Li ans Be

non-metals: B, C, N, O, F, Ne

halogen: Flourine

noble gas: neon

as moving from left to right in a period number of ELECTRON increase, no.of SHELL remain same, grip to valence electrons increases, nuclear force increases and thus TENDENCY to lose electrons decreases thus METALIC character decreases.

Explanation:



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