what is the difference beween valency and a valence electron?
Asked by | 27th Jan, 2009, 06:55: PM
Valence electrons are the total number of electrons present in the valence shell or outermost shell.
Valency is the combining capapcity of an element.
Valency = no of valence electrons ( if the valence electrons are 1,2,3,4)
= 8 - no. of valence electrons ( if the valence electrons are 5,6,7,8)
For Cl with Atomic number 17
The electronic configuration is 2,8,7
Valence electrons = 7
Valency = 8-7 = 1
For Na with atomic number 11:
The eelctronic configuration = 2,8,1
Valence electrons = 1
Valency = 1
Answered by | 28th Jan, 2009, 11:12: AM
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