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actinium
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The answer ACTINIUM has 7 possible clue(s) in existing crosswords.
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The word ACTINIUM is VALID in some board games. Check ACTINIUM in word games in Scrabble, Words With Friends, see scores, anagrams etc.
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Definitions of actinium in various dictionaries:
noun - a radioactive element of the actinide series
noun - a radioactive element
ACTINIUM - Actinium is a chemical element with symbol Ac and atomic number 89. It was discovered by Friedrich Oskar Giesel in 1902, who isolated the element the...
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Possible Jeopardy Clues |
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The elements run alphabetically from this, Ac, to zirconium |
Symbol Ac, this radioactive element is found in uranium ores |
Symbolized Ac, it's alphabetically first among the elements |
Possible Dictionary Clues |
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A radioactive element found in uranium ores, used in equilibrium with its decay products as a source of alpha rays. Its longest lived isotope is Ac 227 with a half-life of 21.6 years. Atomic number 89 melting point 1,050C boiling point (estimated) 3,200C specific gravity (calculated) 10.07 valence 3. See Table at element. |
the chemical element of atomic number 89, a radioactive metallic element of the actinide series. It is rare in nature, occurring as an impurity in uranium ores. |
a radioactive element of the actinide series found in uranium ores |
The chemical element of atomic number 89, a radioactive metallic element of the actinide series. It is rare in nature, occurring as an impurity in uranium ores. |
Actinium description |
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Actinium is a chemical element with symbol Ac and atomic number 89. It was discovered by Friedrich Oskar Giesel in 1902, who isolated the element the same year. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. It is also sometimes considered the first of the 7th-period transition metals, although lawrencium is less commonly given that position. Together with polonium, radium, and radon, actinium was one of the first non-primordial radioactive elements to be isolated. * A soft, silvery-white radioactive metal, actinium reacts rapidly with oxygen and moisture in air forming a white coating of actinium oxide that prevents further oxidation. As with most lanthanides and many actinides, actinium assumes oxidation state +3 in nearly all its chemical compounds. Actinium is found only in traces in uranium and thorium ores as the isotope 227Ac, which decays with a half-life of 21.772 years, predominantly emitting |