Question

The 3d transition series starts from which atomic number?

Answer 1

Transition elements

• These 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: $(\mathrm{n}-1){\mathrm{d}}^{1-10}{\mathrm{ns}}^{1\mathrm{or}2}$ 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.