1) Atomic number 72 2) Chemical element 3) Element discovered in 1923 4) Element number 72 5) Element with the symbol Hf 6) Metal 7) Metallic element
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https://www.crosswordclues.com/clue/hafnium
1) Hf
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https://www.crosswordclues.com/clue/hafnium
Hafnium is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals. Its existence was predicted by Dmitri Mendeleev in 1869, though hafnium was not identified until 1923, making it the penultimate stable isotope ele...
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http://en.wikipedia.org/wiki/Hafnium
chemical element (atomic number 72), metal of Group IVb of the periodic table. It is a ductile metal with a brilliant silvery lustre. The Dutch ... [4 related articles]
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http://www.britannica.com/eb/a-z/h/3
<chemical> Hafnium. A metal element of atomic number 72 and atomic weight 178.49, symbol hf. ... Chemical name: Hafnium ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973
(Hf) (haf´ne-әm) a chemical element, atomic number 72, atomic weight 178.49.
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http://www.encyclo.co.uk/local/21001
(Hf) Type: Term Pronunciation: haf′nē-ŭm Definitions: 1. A rare chemical element, atomic no. 72, atomic wt. 178.49.
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http://www.medilexicon.com/medicaldictionary.php?t=39026
Hafnium is a silvery metal element with the symbol Hf occurring in zircon and used in nuclear reactors in the control rods and also used for light-bulb filaments. It was named in 1923 by the Dutch physicist Dirk Coster and Hungarian chemist Georg von Hevesy after the city of Copenhagen, where the element was discovered (Hafnia is Latin for Copenhag...
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http://www.probertencyclopaedia.com/browse/GH.HTM
[
n] - a gray tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals
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http://www.webdictionary.co.uk/definition.php?query=hafnium
Hafnium is a silvery coloured, ductile metal which is found in all minerals containing zirconium. The chemistries of the two metals are similar which makes them difficult to separate, and the properties of each are greatly affected by the presence of the other as an impurity. Both zirconium and hafnium are extracted as the pure metal by reducing th...
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https://www.encyclo.co.uk/local/20687
Silvery, metallic element, atomic number 72, relative atomic mass 178.49. It occurs in nature in ores of zirconium, the properties of which it resembles. Hafnium absorbs neutrons better than most metals, so it is used in the control rods of nuclear reactors; it is also used for light-bulb filaments. It was named in 1923 by Dutch physicist D...
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https://www.encyclo.co.uk/local/21221
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