1.

The 4s subshell has more energy than 3p subshell. (a) Is it true? Justify your answer. (b) State Aufbau principle.

Answer»

(a) Yes. For both 4s and 3p subshells the (n+l) value is 4. But 4s, with high value of ‘n’ has higher energy. 

(b) Aufbau principle – In the ground state of the atoms, the orbitals are filled in order of their increasing energies.



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