- Which of the following transitions are allowed in the normal electronic emission spectrum of an atom: (a) 2s ® 1s, (b) 2p ® 1s, (c) 3d ® 2p?
- Which of the following transitions are allowed in the normal electronic emission spectrum of an atom: (a) 5d ® 2s, (b) 5p ® 3s, (c) 5p ® 3f?
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