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NEET2009ChemistryStructure of AtomActual

Which of the following is not permissible arrangement of electrons in an atom ?

Options

  1. An =4, l =0, ~m =0, ~s =-1 / 2
  2. Bn =5, l =3, ~m =0, ~s =+1 / 2
  3. Cn =3, l =2, ~m =-3, ~s =-1 / 2
  4. Dn =3, l =2, ~m =-2, ~s =-1 / 2

Correct answer

C. n =3, l =2, ~m =-3, ~s =-1 / 2

Step-by-step solution

Key Idea For an electron, n may be 0,1,2 and l =0 to n -1 and m =- l to + l (including 0) and s = 1 2 Hence, if aligned n & =3 l & =0 to (3-1) & =0,1,2 ~m & =- l to +1 & =-2-1,0,+1,+2 ~s & = 1 2 aligned Therefore, option (c) is not a permissible set of quantum numbers.

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