any of a number of chemical elements that form negative ions, have acidic oxides, and are generally poor conductors of heat and electricity
nonmetal in American English
(nɑnˈmɛtəl)
noun
any of those elements lacking the characteristics of a metal; specif., any of theelectronegative elements (e.g., oxygen, carbon, nitrogen, fluorine, phosphorus, sulfur) whose oxides form acids and stable compounds with hydrogen