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NCERT Class XI Chemistry Structure of Atom Solutions

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Question : 28 of 67
Marks: +1, -0
(i) An atomic orbital has n = 3. What are the possible values of l and mlm_l?
(ii) List the quantum numbers (mlm_l and l) of electrons for 3d orbital.
(iii) Which of the following orbitals are possible? 1p, 2s, 2p and 3f.
Solution:  
(i) When n = 3, l = 0, 1, 2
When l = 0, mlm_l = 0. When l = 1, mlm_l = –1, 0, +1.
When l = 2, mlm_l = –2, –1, 0, +1, +2.
(ii) For 3d-orbital l = 2, mlm_l = –2, –1, 0, +1, +2
(iii) For a particular value of n, the allowed values of l are 0 to n – 1 only.
Hence, 2s and 2p are the only possible orbitals.
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