Which of the following electronic transitions are allowed for thehydrogen atom?

Question

Which of the following electronic transitions are allowed for thehydrogen atom?
a. 2s -> 1s b. 2p -> 1s c. 3d -> 2p d. 5d -> 3s e. 5p -> 3s
Also... is 0 change in n possible, for instance, if you had 2p-> 2s ?
Also... does it matter that hydrogen is only 1s? Would thiskind of stuff change for helium?
a. 2s -> 1s b. 2p -> 1s c. 3d -> 2p d. 5d -> 3s e. 5p -> 3s
Also... is 0 change in n possible, for instance, if you had 2p-> 2s ?
Also... does it matter that hydrogen is only 1s? Would thiskind of stuff change for helium?

Explanation / Answer

Selection rule for allowed transition are l=±1 a.) For 2s......>1s        l = 0-0 =0 So not allowed. b) For 2p........>1s         l = 0 - 1 =-1 So allowed c) For 3d...........>2p      l = 1- 2 = -1 So allowed d) For 5d.........> 3s      l = 0 - 2 =-2 So not allowed e) For 5p .........> 3s     l = 0 - 1 = -1 So allowed. --------------- 0 change in n possible because for 2p....>2s ;for both n = 2 hence n = 0 ------------ No, 1s is a one energy state of the electron in thehydrogen, it does not mean that the electron always be in the 1sstate.

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