[zaric]

Can someone please tell me the amount of valence electrons in all of the layers on the periodic table. I find it very confusing after it gets past krypton. The atomic number increases with different intervals(18,32) on the noble gases afterwards. For example, Iodine has an atomic number of 53, the last element with a full valence shell is Kr with 36 electron, doesn't that mean I has 17 valence electron? I know i'm wrong, but can someone please explain what i'm doing wrong?

[Vidya]

Yes you need a good understanding of periodic table.Each group has a fixed number of valence electrons for its member elements.So I Cl,F, and Br all have different atomic numbers but same valence electrons and that is 7 in their outermost shell.Try to understand how  is periodic table build up ?

[AWK]

For example, Iodine has an atomic number of 53, the last element with a full valence shell is Kr with 36 electron, doesn't that mean I has 17 valence electron?

Iodine has 17 electrons more than Kr

[zaric]

Thank you