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Melting point in group 14 decreases from C (covalent network) to Sn and Pb (metallic), with Sn having the lowest among C, Si, Ge, and Sn due to weaker metallic bonding.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy
Electronegativity decreases down a group. Among C, Si, Ge, and Pb (group 14), C (period 2) has the highest value.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency
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