How do you calculate valency of an element from its electronic configu

1.	How do you calculate valency of an element from its electronic configuration?
Answer» Solution :(i) Electronic configuration tells about the valence ELECTRONS. If the NUMBER of valence electrons are 1, 2 or 3, then such elements will donate 1, 2 or 3 electrons. Their valency is also 1, 2 or 3 RESPECTIVELY. (ii) If an ELEMENT has 4 valence electrons , it shares all 4 electrons, so the valency is 4 . If the number of valence electrons are 5, 6 or 7 electrons, then such elements accept 3 , 2 or 1 electrons respectively, thus their valency is 3, 2 or 1 . (iii) When the valence electrons ar e 2 (for only one shell) or 8 then it is a stable electronic configuration. Thus, the valency is zero.

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