Among the given statements about electronic conductance, the correct statements are

(A) The electronic conductance depends on the nature and structure of the metal
(B) The electronic conductance depends on temperature (it decreases with increase in temperature)
(C) The composition of the metallic conductor remains unchanged during electronic conductance.
(D) The electronic conduction depends on the number of valence electrons per atom.

Choose the correct answer from the options given below:

(A), (B), (C) and (D)

The correct answer is Option (3) → (A), (B), (C) and (D)

Core Concept

Electronic conductance in metals occurs due to the movement of free electrons (not ions). It is a physical process, so the metal does not chemically change.

Statement-wise Explanation
(A) Depends on nature and structure of metal
Correct. Different metals have different numbers of free electrons and different lattice structures, which affect conductivity (e.g., Ag > Cu > Fe).
(B) Depends on temperature
Correct. In metals, increasing temperature increases lattice vibrations, which scatter electrons more, so conductivity decreases (resistance increases).
(C) Composition remains unchanged
Correct. No chemical reaction occurs in metallic conduction; electrons move but atoms stay the
same.
(D) Depends on number of valence electrons
Correct. More valence electrons generally mean more free electrons available for conduction (e.g., alkali metals vs transition metals).