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Which orbital in each of the following p...

Which orbital in each of the following pairs is lower in energy in a many electron atom?
`(i) 2s , 2p " " (ii) 3p, 3d`
`(iii) 3s, 4s " " (iv) 4d , 5f`

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(a) `2s lt 2p` (b) `p lt 3d` (c) `3s lt 4s` (d) `4d lt 5f`
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