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Q.

According to Aufbau's principle, which of the three 4d,5p and 5s will be filled with electrons first

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a

4d

b

5p

c

5s

d

4d and 5s will be filled simultaneously

answer is C.

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Detailed Solution

According to the Aufbau's principle, electron will first enters in those orbital which have least energy. Sodecreasing order of energy is 5p>4d>5s.
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