4. How much energy is required to vaporize 10.00 grams of water at
its boiling point?
(1) 100) (3) 2,260
(2) 260 3
(4) 22,600 )

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

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