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How to find valencies of elements with their atomic number

Answer»

Hi...
here is your ANSWER:

Lets take example:

i) sodium: atomic number = 11
Electronic configuration : 2,8,1
VALENCY = +1

ii) oxygen: atomic number = 8
Electronic configuration : 2,6
valency = (8-6) = 2

iii) CARBON: atomic no. =6
Electronic configuration : 2,5
valency = ±4

hope U will understand from these examples :-)



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