In multi electron atom, 4s orbital is lower on energy than
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energy orbitals after 4s
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The energy is governed by the (n+l) rule. The greater the (n+l) value the greater is the energy.
So,
4s. n= 4 and l = 0,n+l = 4
3d n= 3 and l= 2 ,n+l = 5
So, 3d has more energy than 4s
So,
4s. n= 4 and l = 0,n+l = 4
3d n= 3 and l= 2 ,n+l = 5
So, 3d has more energy than 4s
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