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Q. If 's' can have `+1/2` , `-1/2` , `+1` , `-1` , `+2` , `-2` values possible then...

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user8235304 | Student, Grade 11 | (Level 1) Valedictorian

Posted July 25, 2013 at 5:34 PM via web

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Q. If 's' can have `+1/2` , `-1/2` , `+1` , `-1` , `+2` , `-2` values possible then electronic congifuration of `_14Si` is:-

A) `[Ne]3s^2 3p^2`

B) `[C]2s^6 2p^2`

C) `[Mg]2p^2`

D) `[He]2s^2 2p^6 3s^2 3p^2`

[s is spin quantum number.]

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llltkl | College Teacher | (Level 3) Valedictorian

Posted July 25, 2013 at 6:42 PM (Answer #1)

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If 's' can have values of +1/2,-1/2,+1,-1,+2,-2, i.e. six values in total, then for each set of values of `n` , `l` , and `m_l` , i.e. for each orbital, an electron can assume six different 's' values. In other words the capacity of each orbital would then be six.

It follows that, the maximum capacity of different type of orbitals would then be as follows: s(6), p(18), d(30), f(42).

Then the electronic configuration of Si(14): `1s^6,2s^6,2p^2`

i.e. `[C]2s^6,2p^2`

Therefore, correct answer is Option B).

[Note: C(6) would have been the first inert gas then].


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