1.

As per Aufbau principle, arrange the orbitals in increasing order of energy.

Answer»

`4p GT 4D gt 5S gt 5p`
`4p lt 4d lt 5s lt 5p`
`4d lt 4p lt 5s lt 5p`
`4p lt 5s lt 4d lt 5p`

Answer :D


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