Hi...here is your ANSWER:Lets take example: i) sodium: atomic number = 11 Electronic configuration : 2,8,1 VALENCY = +1ii) oxygen: atomic number = 8 Electronic configuration : 2,6 valency = (8-6) = 2iii) CARBON: atomic no. =6 Electronic configuration : 2,5 valency = ±4hope U will understand from these examples :-)
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