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Allotropes Some elements exist in several different structural forms, called allotropes. Each allotrope has different physical properties. For more information on the Visual Elements image see the Uses and properties section below. Group A vertical column in the periodic table. Members of a group typically have similar properties and electron configurations in their outer shell.
Period A horizontal row in the periodic table.
Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force. It was first isolated from potash , the ashes of plants, from which its name derives. In the periodic table , potassium is one of the alkali metals , all of which have a single valence electron in the outer electron shell, that is easily removed to create an ion with a positive charge — a cation , that combines with anions to form salts.
Potassium in nature occurs only in ionic salts. Elemental potassium reacts vigorously with water, generating sufficient heat to ignite hydrogen emitted in the reaction, and burning with a lilac – colored flame. It is found dissolved in sea water which is 0. Potassium is chemically very similar to sodium , the previous element in group 1 of the periodic table. They have a similar first ionization energy , which allows for each atom to give up its sole outer electron. It was suspected in that they were distinct elements that combine with the same anions to make similar salts,  and was proven in using electrolysis.
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Potassium—argon dating , abbreviated K—Ar dating , is a radiometric dating method used in geochronology and archaeology. It is based on measurement of the product of the radioactive decay of an isotope of potassium K into argon Ar. Potassium is a common element found in many materials, such as micas , clay minerals , tephra , and evaporites. In these materials, the decay product 40 Ar is able to escape the liquid molten rock, but starts to accumulate when the rock solidifies recrystallizes. The amount of argon sublimation that occurs is a function of the purity of the sample, the composition of the mother material, and a number of other factors.
Time since recrystallization is calculated by measuring the ratio of the amount of 40 Ar accumulated to the amount of 40 K remaining. The long half-life of 40 K allows the method to be used to calculate the absolute age of samples older than a few thousand years. The quickly cooled lavas that make nearly ideal samples for K—Ar dating also preserve a record of the direction and intensity of the local magnetic field as the sample cooled past the Curie temperature of iron.
In Honor Of National Chemistry Week, Here Are 15 Jokes Only Chemists Will Get
Radiocarbon dating also referred to as carbon dating or carbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon , a radioactive isotope of carbon. The method was developed in the late s at the University of Chicago by Willard Libby , who received the Nobel Prize in Chemistry for his work in It is based on the fact that radiocarbon 14 C is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen.
The resulting 14 C combines with atmospheric oxygen to form radioactive carbon dioxide , which is incorporated into plants by photosynthesis ; animals then acquire 14 C by eating the plants. When the animal or plant dies, it stops exchanging carbon with its environment, and thereafter the amount of 14 C it contains begins to decrease as the 14 C undergoes radioactive decay.
Thorium is a weakly radioactive metallic chemical element with the symbol Th and atomic Two radiometric dating methods involve thorium isotopes: uranium–thorium For example, when treated with potassium fluoride and hydrofluoric acid, Th4+ forms the complex anion ThF 2− 3 · Na · Mg · Al · Si · P · S · Cl · Ar · 4 · K.
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Subscriber Account active since. National Chemistry Week runs from Oct. In honor of our most elemental heh heh science, how about some chemistry jokes? These 15 chemistry jokes and puns are really cheesy and may only have the power to make a chemist laugh, but don’t worry: we’ve included an explanation below each joke so at least you’ll understand their cheesiness.
And maybe even learn something along the way. Two chemists go into a bar. The first one says “I think I’ll have an H2O.
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Radiocarbon dating has transformed our understanding of the past years. Professor Willard Libby produced the first radiocarbon dates.
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Related to potassium bicarbonate: Potassium citrate. A compound, KHCO 3 , in the form of a white powder or colorless crystals, used in baking powder and in medicine as an antacid and in the treatment of potassium deficiency. Switch to new thesaurus.
Also found in: Thesaurus, Medical, Acronyms, Encyclopedia, Wikipedia. Related to potassium bicarbonate: Potassium citrate. potassium bicarbonate. n. A.
Thorium is a weakly radioactive metallic chemical element with the symbol Th and atomic number Thorium is silvery and tarnishes black when it is exposed to air, forming thorium dioxide ; it is moderately hard, malleable , and has a high melting point. All known thorium isotopes are unstable. The most stable isotope, Th, has a half-life of On Earth, thorium, bismuth , and uranium are the only three radioactive elements that still occur naturally in large quantities as primordial elements.
Its first applications were developed in the late 19th century. Thorium’s radioactivity was widely acknowledged during the first decades of the 20th century. In the second half of the century, thorium was replaced in many uses due to concerns about its radioactivity. Thorium is still being used as an alloying element in TIG welding electrodes but is slowly being replaced in the field with different compositions. It was also material in high-end optics and scientific instrumentation, used in some broadcast vacuum tubes, and as the light source in gas mantles , but these uses have become marginal.
It has been suggested as a replacement for uranium as nuclear fuel in nuclear reactors , and several thorium reactors have been built. Thorium is also used to strengthen magnesium , coating tungsten wire in electrical equipment, controlling the grain size of tungsten in electric lamps , high-temperature crucibles, in glasses and used in camera and scientific instrument lenses. Other uses for thorium include heat-resistant ceramics, aircraft engines , and in light bulbs.
Thorium is a moderately soft , paramagnetic , bright silvery radioactive actinide metal.