WIKIPEDIA
Actinium is a
radioactive chemical
element with symbol Ac (not to be confused with the
abbreviation for an acetyl
group) and has the atomic
number 89, which was discovered in 1899
ONLINE
ETYMOLOGY DICTIONARY:
- radioactive element discovered in 1899, from Greek actin-, comb. form of aktis (genitive aktinos) "ray, radiance" (see actino-) + chemical suffix -ium.
- before vowels actin-, word-forming element meaning "pertaining to rays," from Greek aktis (genitive aktinos) "ray, radiance;" perhaps cognate with Sanskrit aktuh "light, ray," Gothic uhtwo "dawn, daybreak," Lithuanian anksti "early."
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