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Topic: Valence Electron Problem  (Read 2622 times)

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Offline zaric

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Valence Electron Problem
« on: February 16, 2009, 07:30:30 AM »
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?

Offline Vidya

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Re: Valence Electron Problem
« Reply #1 on: February 16, 2009, 08:48:10 AM »
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 ?

Offline AWK

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Re: Valence Electron Problem
« Reply #2 on: February 16, 2009, 08:51:17 AM »
Quote
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
AWK

Offline zaric

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Re: Valence Electron Problem
« Reply #3 on: February 16, 2009, 09:15:49 AM »
Thank you

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