which of the following is a possible ending of an electron
configuration for an element with the Lewis structure pictured below:
a. 5s2 4d3   b. 4s2 3d10 4p1  c. 2s1 2p2

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Request for Question Clarification by livioflores-ga on 05 Jul 2003 18:38 PDT

What is the pictured Lewis structure?

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Clarification of Question by teatea-ga on 05 Jul 2003 19:19 PDT

This the only "structure" given in a,b,c.No other details given.
Thanks again,

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Clarification of Question by teatea-ga on 05 Jul 2003 21:34 PDT

Sorry for not noticing the "Lewis structure pictured below" which
consists of a capital:       X:

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Request for Question Clarification by livioflores-ga on 05 Jul 2003 23:08 PDT

Let me see if I understand:
The "Lewis structure pictured below" is X: (an X that represent the
element and the two dots that represent two valence electrons, like Ö:
shows four valence electrons for the element O).
Am I right?

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Clarification of Question by teatea-ga on 06 Jul 2003 12:19 PDT

You are right, Livio.
An X that represents the
element and the two dots that represent two valence electrons, like O:

Hello,

This question tests your knowledge of the number of electrons which
will fit into electron shells.  The simplest way of looking at it is:

orbital   # of electrons
S             2
P             6
D            10

Valence electrons are in the outermost electron shell and, to be
reactive, need to be in a shell that is not full.  Therefore, if we
examine the possible answers for unfilled orbitals, we will have the
answer.

a. 5s2 4d3                the outermost shell here is a 'd' orbital
with 3
b. 4s2 3d10 4p1           here the outermost is a 'p' orbital with 1
c. 2s1 2p2                and here, the answer, is a 'p' orbital with
only 2


Reference:
http://www.miramar.sdccd.cc.ca.us/faculty/fgarces/ChemComon/Tutorial/Lewis/LewisTutorial.pdf

synarchy

Google search
valence tutorial

I have a doubt here, the answer given for synarchy-ga is correct (and
logical, is the only possible answer).
But why is the level 2s incomplete? Is there a typo or may be we have
a ion or something, can someone tell me the true?