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Oxygen is the third most abundant chemical element in the universe, after hydrogen and helium. [68] About 0.9% of the Sun's mass is oxygen. [19] Oxygen constitutes 49.2% of the Earth's crust by mass [69] as part of oxide compounds such as silicon dioxide and is the most abundant element by mass in the Earth's crust.
Typical values for Pr are: 0.003 for molten potassium at 975 K [1] around 0.015 for mercury; 0.065 for molten lithium at 975 K [1] around 0.16–0.7 for mixtures of noble gases or noble gases with hydrogen; 0.63 for oxygen [1] around 0.71 for air and many other gases; 1.38 for gaseous ammonia [1] between 4 and 5 for R-12 refrigerant; around 7. ...
Carbon monoxide (chemical formula CO) is a poisonous, flammable gas that is colorless, odorless, tasteless, and slightly less dense than air.Carbon monoxide consists of one carbon atom and one oxygen atom connected by a triple bond.
In the periodic table, it appears between the elements europium to its left and terbium to its right, and above the actinide curium. It is a silvery-white, malleable, ductile rare-earth element. Its 64 electrons are arranged in the configuration of [Xe]4f 7 5d 1 6s 2, of which the ten 4f, 5d, and 6s electrons are valence.
Most values have been rounded to three decimals.) ... 2012 KA 4: 0.242 1.100 1.958 5.806 0.7801 21.1 ... Toggle the table of contents.
Cobalt is a chemical element; it has symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, somewhat brittle, gray metal.
[55] [56] [57] Bromine is the tenth most abundant element in seawater. [58] The main sources of bromine production are Israel and Jordan. [59] The element is liberated by halogen exchange, using chlorine gas to oxidise Br − to Br 2. This is then removed with a blast of steam or air, and is then condensed and purified. [60]
It is an actinide and the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities, although pure fermium metal has not been prepared yet. [5] A total of 20 isotopes are known, with 257 Fm being the longest-lived with a half-life of 100.5 days.