Atomic Structure - Result Question 49

####25. The electrons, identified by quantum numbers n and l,

(i) n=4,l=1, (ii) n=4,l=0, (iii) n=3,l=2, (iv) n=3,l=1 can be placed in order of increasing energy, from the lowest to highest, as

(1999, 2M)

(a) (iv) < (ii) < (iii) < (i)

(b) (ii) < (iv) < (i) < (iii)

(c) (i) < (iii) < (ii) < (iv)

(d) (iii) < (i) < (iv) < (ii)

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Solution:

  1. (i) n=4,l=14p-orbital

(ii) n=4,l=04s-orbital

(iii) n=3,l=23d-orbital

(iv) n=3,l=13d-orbital

According to Aufbau principle, energies of above mentioned orbitals are in the order of

(iv) 3p< (ii) 4s< (iii) 3d< (i) 4p



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