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Rocky Mountain Bicycles has won Mountain Bike Magazine's 'Mountain Bike of the Year' award three times - for the Hammer Race in 1996, the Element Race in 2000, and the Slayer in 2002. Rocky Mountain has also seen one of its sponsored riders, Marie-Hélène Prémont, win a silver Olympic medal in 2004. [7] On December 19, 2024 Rocky Mountain ...
Carbonatite (/ k ɑːr ˈ b ɒ n ə ˌ t aɪ t /) is a type of intrusive or extrusive igneous rock defined by mineralogic composition consisting of greater than 50% carbonate minerals. [1] Carbonatites may be confused with marble and may require geochemical verification.
C 50 H 48 O 4: violanthrone-79: 85652-50-2 C 50 H 49 N 15 O 15 S: geninthiocin: 158792-27-9 C 50 H 50 N 14 O 9 S 6: amythiamicin C: 156620-47-2 C 50 H 51 N 15 O 8 S 6: amythiamicin A: 152741-89-4 C 50 H 53 N 15 O 9 S 6: amythiamicin B: 156620-48-3 C 50 H 57 N 3 O 12: NCI 144-128: 36674-84-7 C 50 H 60 O 10: ergophilone A: 166603-97-0 C 50 H 60 ...
[169] [170] Hafnium was the last stable element to be discovered (noting however the difficulties regarding the discovery of rhenium). 43 Technetium: 1937 C. Perrier and E. Segrè: 1937 C. Perrier & E. Segrè The two discovered a new element in a molybdenum sample that was used in a cyclotron, the first element to be discovered by synthesis. It ...
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The abundance of the chemical elements is a measure of the occurrences of the chemical elements relative to all other elements in a given environment. Abundance is measured in one of three ways: by mass fraction (in commercial contexts often called weight fraction), by mole fraction (fraction of atoms by numerical count, or sometimes fraction of molecules in gases), or by volume fraction.