i 1 s 1 o 1 t 1 o 1 p 3 e 1
7 letters · 9 points in Scrabble
Meaning
noun one of two or more atoms with the same atomic number but with different numbers of neutrons
originFrom iso- (“equal”) + -tope (“place”), because the different isotopes of an element always occupy the same place in the periodic table. The term was coined by Scottish doctor Margaret Todd in 1909 and first used publicly on February 27, 1913 by English chemist Frederick Soddy.
Etymology from Wiktionary, CC BY-SA 3.0