Articles from Britannica Encyclopedias for elementary and high school students. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Magnesium is the chemical element in the periodic table that has the symbol Mg and atomic number 12 and an atomic mass of 24.31. Sodium is a soft, silvery-white, highly reactive metal. 1) You may use almost everything for non-commercial and educational use. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. Thulium is the thirteenth and third-last element in the lanthanide series. Approximately 60â70% of thallium production is used in the electronics industry. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. The photosynthetic function of plants depends upon the action of chlorophyll pigments, which contain magnesium at the centre of a complex, nitrogen-containing ring system (porphyrin). Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure. The chemical symbol for Thulium is Tm. The chemical symbol for Copper is Cu. The volume of an atomÂ is aboutÂ 15 orders of magnitudeÂ largerÂ than the volume of a nucleus. Views expressed here do not necessarily reflect those of ScienceDaily, its staff, its contributors, or its partners. The chemical symbol for Titanium is Ti. As a result, the electron cloud contracts and the atomic radius decreases. The chemical symbol for Iron is Fe. Please select which sections you would like to print: Corrections? Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. 24Mg, 25Mg, 26Mg. Discoverer: Priestley, Joseph and Scheele, Carl Wilhelm, Discoverer: Ramsay, William and Travers, Morris, Discoverer: Ramsay, Sir William and Strutt, John (Lord Rayleigh), Discoverer: Del Rio, AndrÃ©s Manuel (1801) and SefstrÃ¶m, Nils Gabriel (1830), Discoverer: Lecoq de Boisbaudran, Paul-Ãmile, Discoverer: Ramsay, Sir William and Travers, Morris, Discoverer: Bunsen, Robert Wilhelm and Kirchhoff, Gustav Robert, Discoverer: Perrier, Carlo and SegrÃ¨, Emilio, Discoverer: Reich, Ferdinand and Richter, Hieronymus, Discoverer: MÃ¼ller von Reichenstein, Franz Joseph, Discoverer: Ramsay, William and Travers, Morris William, Discoverer: Kirchhoff, Gustav and Bunsen, Robert. The chemical symbol for Barium is Ba. Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. It also is found as hydroxide (brucite), chloride (carnallite, KMgCl3∙6H2O), and sulfate (kieserite). The chemical symbol for Boron is B. The chemical symbol for Berkelium is Bk. The chemical symbol for Argon is Ar. The chemical symbol for Erbium is Er. The atomic radius of a chemical element is a measure of the distance out to which the electron cloud extends from the nucleus. The density of magnesium is 1.738 grams per cubic centimeter. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. The symmetry properties of the crystal are described by the concept of space groups. In water it forms a suspension known as milk of magnesia, which has long been used as an antacid and a laxative. Consequently, the smallest atom is helium with a radius of 32 pm, while one of the largest is caesium at 225 pm. the electronic shell structure is [2, 8, 2] with Atomic Term Symbol (Quantum Numbers) 1S0. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. It is a white solid used in the manufacture of high-temperature refractory bricks, electrical and thermal insulators, cements, fertilizer, rubber, and plastics. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. To locate Magnesium on periodic Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: GÃ¶hring, Otto and Fajans, Kasimir. Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. The chemical symbol for Caesium is Cs. These electrons together weigh only a fraction (let say 0.05%) of entire atom. Lead is soft and malleable, and has a relatively low melting point. The odourless white powder has many industrial uses—e.g., as a heat insulator for boilers and pipes and as an additive in food, pharmaceuticals, cosmetics, rubbers, inks, and glass. www.nuclear-power.net. three Or view hourly updated newsfeeds in your RSS reader: Keep up to date with the latest news from ScienceDaily via social networks: Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. Our editors will review what you’ve submitted and determine whether to revise the article. Iron is a metal in the first transition series. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. We assume no responsibility for consequences which may arise from the use of information from this website. From the breathless eBay listing: ... You can see photographs of all the samples displayed in a periodic table format: my pictures or their … The atomic number of magnesium is 12 and its atomic mass is 24.305. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. Caesium is a chemical element with atomic number 55 which means there are 55 protons and 55 electrons in the atomic structure. Magnesium with atomic number 12, Â Assuming spherical shape, theÂ uraniumÂ atom have volume of about Â 26.9 Ã10â30Â m3. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. The chemical symbol for Dysprosium is Dy. Neptunium metal is silvery and tarnishes when exposed to air. Mercury is commonly known as quicksilver and was formerly named hydrargyrum.
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