How to find valency electrons of halogen
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the number of valence electrons starts at one for elements in group 1.it then increases by one from left to right across each period each periodic table from groups 1 to 2 , 13 to 18 . halogens have 7 valence electrons......
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A: The number of valence electrons starts at one for elements in group 1. It then increases by one from left to right across each period (row) of the periodic table for groups 1–2 and 13–18 (numbered 3-0 in the periodic table above.) Therefore, halogens have seven valence electrons.
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