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3 days ago · List of chemical elements. 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 ). [1]
2 days ago · Group: group 12: Period: period 6: Block d-block: Electron configuration 4f 14 5d 10 6s 2: Electrons per shell: 2, 8, 18, 32, 18, 2: Physical properties; Phase at STP: liquid: Melting point: 234.3210 K (−38.8290 °C, −37.8922 °F) Boiling point: 629.88 K (356.73 °C, 674.11 °F) Density (near r.t.) 13.546 g/cm 3 Triple point
1 day ago · Atoms are the basic particles of the chemical elements. An atom consists of a nucleus of protons and generally neutrons, surrounded by an electromagnetically bound swarm of electrons. The chemical elements are distinguished from each other by the number of protons that are in their atoms. For example, any atom that contains 11 protons is sodium ...
- 1.67×10−27 to 4.52×10−25 kg
- zero (neutral), or ion charge
5 days ago · The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). [1] The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.
- IIA
- IIA
- beryllium group
- alkaline earth metals
2 days ago · Group 7, numbered by IUPAC nomenclature, is a group of elements in the periodic table. It contains manganese (Mn), technetium (Tc), rhenium (Re) and bohrium (Bh). This group lies in the d-block of the periodic table, and are hence transition metals. This group is sometimes called the manganese group or manganese family after its lightest member ...
- silvery metallic
- 7.21 g·cm −3
- 2334 K (2061 °C)
- 1519 K (1246 °C)
2 days ago · v. t. e. The electron (. e−. or. β−. ) is a subatomic particle with a negative one elementary electric charge. [13] Electrons belong to the first generation of the lepton particle family, [14] and are generally thought to be elementary particles because they have no known components or substructure. [1]
2 days ago · Development The full theory of the finite-dimensional representations of the Lie algebra of the Lorentz group is deduced using the general framework of the representation theory of semisimple Lie algebras. The finite-dimensional representations of the connected component SO (3 ; 1) + {\displaystyle {\text{SO}}(3;1)^{+}} of the full Lorentz group O(3; 1) are obtained by employing the Lie ...
