Physics
Isotopes of an element contain

equal number of protons and electrons
the same number of protons but different number of neutrons
the same number of neutrons but different number of protons
equal number of nucleons

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Physics
Superconductors are those elements

Whose conductivity is intermediate between metals and insulators
Which conduct electricity only at super-high temperatures
Which turn into insulators at very low temperatures
Whose resistance falls almost to zero at very low temperatures

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