Homework Answers
Zr atomic number = 40
electron configuration = [Kr] 4d2 5s2
Outer most shell is called valance shell ; here 5S2 is valance
As atomic number = 33
electronic configuration = [Ar] 3d10 4s2 4p3
here outer shell is 4 th shell
so As valance = 4s2 4p3
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