why 2d,3f are not possible ?
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In the first shell, there is only the 1s orbital, as this shell can have a maximum of only 2 electrons. Therefore, the 1p orbital doesn't exist. ... In the third shell, only the 3s, 3p and 3d orbitals exist, as it can hold a maximum of 18 electrons. Therefore, the 3f orbitals do not exist.
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