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Hace 16 horas · NASA is an acronym that expands to National Aeronautics and Space Administration. An acronym is an abbreviation of a phrase that usually consists of the initial letter of each word in all caps with no punctuation.. For some, initialism, or alphabetism, connotes this general meaning, and acronym is a subset—pronounced as a word rather than as letters.
Hace 16 horas · Vanadium is a chemical element; it has symbol V and atomic number 23. It is a hard, silvery-grey, malleable transition metal. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer ( passivation) somewhat stabilizes the free metal against further oxidation .
