why their is not 1d block in chemistry
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Explanation:
As it has been mentioned, electrons fill orbitals from the lowest energy, to the highest. ... As you can see, the 4S orbital is filled BEFORE the 3D orbital as it has a lower energy, and therefore 3D has to be placed in the 4th row in the periodic table, after 4S. This trend continues as you go down the rows.
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