Question

is there any difference between :
1) effective nuclear charge
2) valence electrons

Answer 1

Well, they have the same value but different in idea.
effective nuclear charge is the value of outer electron charge.
Valence electrons is the number of electrons in the outermost shell.

Answer 2

http://en.wikipedia.org/wiki/Effective_nuclear_charge

Answer 3

they are not the same...

Answer 4

thnks