Abstract
The correlation between the superconducting critical temperature and the number of stable isotopes among superconducting elements has been examined with respect to the simple empirical observations of nuclear stability and the general predictions of the BCS theory. Whereas this correlation does express a causal relationship, this relationship is merely the requirement that the number of electrons equals the number of protons in neutral atoms. The observed covariance is the result of increased nuclear stability at even atomic number and the decrease in the electron density of states at the Fermi level caused by an even number of electrons filling a Brillouin zone.
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