write the valency and usual no of valence electrons of group 18 of the periodic table
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group -18 so,valency is non
and no Valence electron
and no Valence electron
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Group 8 on periodic table has valency of zero for its elements like Helium, Neon, Argon, Krypton and Xenon. They have 8 electrons in their outer most (except He which just 2 in first orbit and hence meets neutral element tag requirements). ... Its group number 18 known as Noble gases.
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