摘要
Using a very useful quantity in physics and chemistry,the electronegativity,we have found that for nearly 70 high-Tc oxide superconductors(HTOS),the average electronegativity is in a narrow range 2.5-2.7.The difference of bond character between the HTOS and the conventional superconductors has been discussed.Finally,two categories of superconductors in terms of the group average electronegativity are suggested.
