astatine /as·ta·tine/ (as´tah-tēn) a chemical element, at. no. 85, symbol At.
astatine (At)
as·ta·tine ( s t -t n , -t n)n. Symbol At A radioactive halogen element. Its longest lived isotope has a mass number of 210 and a half-life of 8.1 hours. Atomic number 85. |
astatine (At)
Etymology: Gk, astasis, unsteady
a very unstable, radioactive element that occurs naturally in tiny amounts. Its atomic number is 85; the atomic mass of its longest lived isotope is 210.
astatine
a chemical element, atomic number 85, atomic weight 210, symbol At. See Table 6.
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