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Lanthanum is a chemical element with the symbol La and the atomic number 57. It is a soft , ductile , silvery-white metal that tarnishes slowly when exposed to air. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table , of which lanthanum is the first and the prototype.
This is an index of lists of molecules (i.e. by year, number of atoms, etc.). Millions of molecules have existed in the universe since before the formation of Earth. Three of them, carbon dioxide, water and oxygen were necessary for the growth of life.
118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
An example of the difference is the empirical formula for glucose, which is CH 2 O (ratio 1:2:1), while its molecular formula is C 6 H 12 O 6 (number of atoms 6:12:6). For water, both formulae are H 2 O. A molecular formula provides more information about a molecule than its empirical formula, but is more difficult to establish.
F 2 La: lanthanum difluoride: 15948-68-2 F 2 Li 2: lithium fluoride: 12265-82-6 F 2 Mg: magnesium fluoride: 7783-40-6 F 2 Mn: manganese difluoride: 7782-64-1 F 2 Mo: molybdenum difluoride: 20205-60-1 F 2 MoO 2: molybdenum difluoride dioxide: 13824-57-2 F 2 N: difluoroamino radical: 3744-07-8 F 2 N 2 O: nitrosodifluoroamine: 14984-78-2 F 2 Na 2 ...
Radium chloride is an inorganic compound with the chemical formula Ra Cl 2. It is a radium salt of hydrogen chloride. It was the first radium compound isolated in a pure state. Marie Curie and André-Louis Debierne used it in their original separation of radium from barium.
Chemical formulas can be used to describe the relative amounts of elements present in a compound. For example, the chemical formula for water is H 2 O: this means that each molecule of water is constituted by 2 atoms of hydrogen (H) and 1 atom of oxygen (O). The chemical composition of water may be interpreted as a 2:1 ratio of hydrogen atoms ...
For organometallic compounds of groups 1–2 can use additive (indicating a molecular aggregate) or compositional naming. Examples are: [BeEtH] named ethylhydridoberyllium or ethanidohydridoberyllium [Mg(η 5-C 5 H 5) 2] named bis(η 5-cyclopentadienyl)magnesium, or bis(η 5-cyclopentadienido)magnesium; Na(CHCH 2) sodium ethenide (compositional ...