How does metallic character vary in 3d transition elements?

1.	How does metallic character vary in 3d transition elements?
Answer» 1. In 3d-series elements as atomic number increases from scandium (Sc [Ar]¹⁸3d¹4s²) the number of unpaired electrons increases up to 3d⁵ in chromium. 2. As the number of unpaired electrons increases, the metallic character increases, hence the melting points and boiling points increase from ₂₁Sc(3d¹) to ₂₄Cr(3d⁵). 3. After chromium the number of unpaired electrons goes on decreasing due to the pairing of electrons, hence metallic character, melting points and boiling points decrease from ₂₅Mn to ₂₉Cu. 4. Zinc has all electrons paired, hence it is soft, has a low melting and boiling points.

Answer»

1. In 3d-series elements as atomic number increases from scandium (Sc [Ar]¹⁸3d¹4s²) the number of unpaired electrons increases up to 3d⁵ in chromium.

2. As the number of unpaired electrons increases, the metallic character increases, hence the melting points and boiling points increase from ₂₁Sc(3d¹) to ₂₄Cr(3d⁵).

3. After chromium the number of unpaired electrons goes on decreasing due to the pairing of electrons, hence metallic character, melting points and boiling points decrease from ₂₅Mn to ₂₉Cu.

4. Zinc has all electrons paired, hence it is soft, has a low melting and boiling points.

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