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# The 3d transition series starts from which atomic number?

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## Transition elementsThese elements are the elements in the periodic table that have partially filled d orbital.The general electronic configuration of transition state metals is is given as: $\left(\mathrm{n}-1\right){\mathrm{d}}^{1-10}{\mathrm{ns}}^{1\mathrm{or}2}$ where $\mathrm{n}$ is the principal quantum number. The transition elements are divided into 3d, 4d, and 5d series as the 3d, 4d, and 5d orbitals are partially filled respectively. The 3d transition series starts from scandium whose atomic number is 21. Hence, the 3d transition series starts from which atomic number 21.

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