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Some people write the d-block before the s-block because when an element is losing electrons, it'll lose them from the s-block first. However, my TA said that it's more common for people to write the s-block before the d-block because when electrons are being placed into an element, electrons are added to the s-block and then the d-block.
What also helps me remember that the d block comes before the s block in the electron configuration is that the leading coefficients of d and the blocks before it are the same. For example, 3s2, 3p6, 3d10 (3 is the same) and afterwards, the 4th shell begins.
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