What is the quantum number of last electron in chlorine?

1 Answer
Sunayan S
Feb 28, 2018

See below.

Explanation:

The electron configuration of #"Cl"# is #color(red)(1"s"^2)color(green)( 2"s"^2 2"p"^6)color(blue)( 3"s"^2 3"p"^5#.

  • The last electron is in #"M"# orbit.
  • It is in #"P"# orbital.
  • #"P"# orbital has three sub-shell. The last #"e"^-# stays in #"P"_y# orbital.

So, the quantum number will be

#color(red)(ul(bar(|color(red)(n=3)" ; "color(green)(l=1)" ; "color(blue)(m_l=0)" ; "color(brown)(m_s=-1/2)|#

My notebook...

The electron in such a manner fills the orbital of an orbit with same spin then it takes the different spin.

So, last electron is in #"P"_y# orbital.

Hope it helps..
Thank you...

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