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  4. Which of the following explains the sequence of filling the electrons in different shells?

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Q. Which of the following explains the sequence of filling the electrons in different shells?

AIIMSAIIMS 1998Structure of Atom

Solution:

According to Aufbau principle, the subshell with minimum energy is filled up first and when this obtains maximum quota of electrons, then the next subshell of higher energy starts filling. So subshell with lowest $(n +l)$ value is filled first. Sequence comes out to be $: 1 s,\, 2 s,\, 2 p,\, 3 s,\, 3 p,\, 4 s,\, 3 d,\, 4 p,\, 5 s,\, 4 d,\, 5 p,\, 6 s,\, 4 f$ etc.