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1 March, 19:16

Question 4 Unsaved When writing electron configuration the 3d block comes after the 4s block. Question 4 options: True False

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  1. 1 March, 19:30
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    True

    Explanation:

    According to Aufbau's principle "sublevels with lower energies are filled up before those with higher energies".

    Sublevels do not fill up in numerical order but there is a certain manner in which they are filled. The pattern is shown below:

    1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p e. t. c

    We see that the 4s gets filled before the 3d sublevel.
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