actinium
|ac-tin-i-um|
C2
/ækˈtɪniəm/
radioactive element
Etymology
Etymology Information
'actinium' originates from the Greek word 'aktinos,' meaning 'ray' or 'beam,' due to its radioactive properties.
Historical Evolution
'actinium' was discovered in 1899 by Friedrich Oskar Giesel and named for its radioactivity, which emits rays.
Meaning Changes
Initially, it was identified as a new element due to its radioactive properties, and this meaning has remained consistent.
Meanings by Part of Speech
Noun 1
a radioactive chemical element with the symbol Ac and atomic number 89, found in uranium ores.
Actinium is used in radiation therapy for cancer treatment.
Last updated: 2025/04/29 19:06