Evaluate the following statements related to group 14 elements for their correctness.

(A) Covalent radius decreases down the group from C to Pb in a regular manner.

(B) Electronegativity decreases f

Question

Evaluate the following statements related to group 14 elements for their correctness.

(A) Covalent radius decreases down the group from C to Pb in a regular manner.

(B) Electronegativity decreases from C to Pb down the group gradually.

(C) Maximum covalence of C is 4 whereas other elements can expand their covalence due to presence of d orbitals.

(D) Heavier elements do not form  bonds.

(E) Carbon can exhibit negative oxidation states.

Choose the correct answer from the options given below:

Canvas Classes · Accepted Answer

Analysis:

(A) FALSE — Covalent radius does NOT decrease regularly. It increases from C to Si to Ge to Sn to Pb, but with an anomaly at Ge (d-orbital contraction). ✗

(B) FALSE — Electronegativity does NOT decrease gradually. There is an anomaly — Ge has slightly higher electronegativity than Si due to d-orbital effects. ✗

(C) TRUE — C has no d-orbitals, so maximum covalence = 4. Si, Ge, Sn, Pb have d-orbitals and can expand covalence (e.g., , covalence = 6). ✓

(D) TRUE — Heavier Group 14 elem

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