Structure of Atom - Result Question 55

####59. The order of filling of electrons in the orbitals of an atom will be

[1991]

(a) 3d,4s,4p,4d,5s

(b) 4s,3d,4p,5s,4d

(c) 5s,4p,3d,4d,5s

(d) 3d,4p,4s,4d,5s

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Solution:

  1. (b) The sub-shell with lowest value of (n+l) is filled up first. When two or more sub-shells have same (n+l) value the subshell with lowest value of ’ n ’ is filled up first therefore the correct order is orbital 4s3d4p5s4d n+l4+03+24+15+04+2  value =45556


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