A metal that does not act as a conductor of electric current is:

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Sodium

Silver

Aluminium

None of these

answer is D.

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Detailed Solution

Concept: Substances having free electrons are good electrical conductors.
Metals are able to donate electrons and thus act as good conductors of electricity. Let’s consider the given options.
Sodium has an atomic number 11 and an electronic configuration 2, 8, 1. The atom donates one electron to gain an octet in its valence shell. And thus, is an electric conductor.
Silver has atomic number 47 and an electronic configuration 2, 8, 18, 18, 1. By donating one atom it attains stability and thus is a good conductor.
Aluminium has an atomic number 13 and an electronic configuration 2, 8, 3. By donating 3 electrons it becomes stable and is an electric conductor.
Thus all options are electric conductors. Thus none of the above is the answer.
Hence, the correct answer is option 4.

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