It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C (83.3 °F), which makes it one of only five elemental metals that are liquid at or near room temperature. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide. If you continue to use this site we will assume that you are happy with it. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. 1) You may use almost everything for non-commercial and educational use. Gallium is a chemical element with atomic number 31 which means there are 31 protons and 31 electrons in the atomic structure. Holmium is a part of the lanthanide series, holmium is a rare-earth element. Fermium is a member of the actinide series. The electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. Its properties are thus intermediate between those of chlorine and iodine. We have also distinguish between the possible and common oxidation states of every element. Gold is a transition metal and a group 11 element. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Discoverer: Ramsey, Sir William and Cleve, Per Teodor. Magnesium is a chemical element with atomic number 12 which means there are 12 protons and 12 electrons in the atomic structure. X + e– → X– + energy        Affinity = – ∆H. These condensers use tubes that are usually made of stainless steel, copper alloys, or titanium depending on several selection criteria (such as thermal conductivity or corrosion resistance). Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten. The chemical symbol for Thallium is Tl. In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. We use cookies to ensure that we give you the best experience on our website. Name: Caesium. Contents. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. ... phone networks, as well as Global Positioning System (GPS) satellites. The electron configuration for cesium is (Rn)7s1. The chemical symbol for Argon is Ar. The chemical symbol for Titanium is Ti. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. The Cookies Statement is part of our Privacy Policy. The chemical symbol for Californium is Cf. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Titanium can be used in surface condensers. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. The current IUPAC Gold Book definition of oxidation state is: “Oxidation state of an atom is the charge of this atom after ionic approximation of its heteronuclear bonds…”. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. The name samarium is after the mineral samarskite from which it was isolated. 3 Chemical and Physical Properties Expand this section. The chemical symbol for Selenium is Se. Check the below NCERT MCQ Questions for Class 10 Science Chapter 5 Periodic Classification of Elements with Answers Pdf free download. Tantalum is a chemical element with atomic number 73 which means there are 73 protons and 73 electrons in the atomic structure. The element cesium (or caesium, atomic number 55) has the electron configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s1 or abbreviated as [Xe] 6s1 The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. In the periodic table, potassium is one of the alkali metals. The chemical symbol for Lead is Pb. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. Cerium is the second element in the lanthanide series. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral). Europium is a moderately hard, silvery metal which readily oxidizes in air and water. Most elements have more than one possible oxidation state. It is the Pauli exclusion principle that requires the electrons in an atom to occupy different energy levels instead of them all condensing in the ground state. Thus, the electron configuration for Mg is 1s 2 2s 2 2p 6 3s 2. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. In the periodic table, the elements are listed in order of increasing atomic number Z. Bromine is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. A freshly exposed surface of pure copper has a reddish-orange color. Europium is one of the least abundant elements in the universe. Caesium was discovered by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff (DE) in 1860. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. The chemical symbol for Neptunium is Np. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Periodic table» Cesium » Electron configuration. The chemical symbol for Bromine is Br. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. Caesium occurs in minute quantity in earth crust in the form of minerals like pollucite (zeolite mineral Caesium ore). Under standard conditions, it is the lightest metal and the lightest solid element. The chemical symbol for Fermium is Fm. The first two columns on the left side of the periodic table are where the s subshells are being occupied. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. Dysprosium is used for its high thermal neutron absorption cross-section in making control rods in nuclear reactors, for its high magnetic susceptibility in data storage applications. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. The chemical symbol for Astatine is At. It is even less abundant than the so-called rare earths. Multiple-site search is loading. It is 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. The periodic table is a tabular display of the chemical elements organized on the basis of their atomic numbers, electron configurations, and chemical properties. Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). The configuration of these electrons follows from the principles of quantum mechanics. Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. Comprehensive information for the element Cesium - Cs is provided by this page including scores of properties, element names in many languages, most known nuclides and … The name xenon for this gas comes from the Greek word ξένον [xenon], neuter singular form of ξένος [xenos], meaning ‘foreign(er)’, ‘strange(r)’, or ‘guest’. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. The chemical symbol for Lithium is Li. Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. The chemical symbol for Osmium is Os. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. 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, Andrés Manuel (1801) and Sefström, Nils Gabriel (1830), Discoverer: Lecoq de Boisbaudran, Paul-Émile, Discoverer: Ramsay, Sir William and Travers, Morris, Discoverer: Bunsen, Robert Wilhelm and Kirchhoff, Gustav Robert, Discoverer: Perrier, Carlo and Segrè, Emilio, Discoverer: Reich, Ferdinand and Richter, Hieronymus, Discoverer: Müller von Reichenstein, Franz Joseph, Discoverer: Ramsay, William and Travers, Morris William, Discoverer: Kirchhoff, Gustav and Bunsen, Robert. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The electronegativity of Caesium is: χ = 0.79. Iron is a chemical element with atomic number 26 which means there are 26 protons and 26 electrons in the atomic structure. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. Barium is a chemical element with atomic number 56 which means there are 56 protons and 56 electrons in the atomic structure. . Lead is soft and malleable, and has a relatively low melting point. It could be part of the main body, but then the periodic table would be rather long and cumbersome. The chemical symbol for Bismuth is Bi. The chemical symbol for Lutetium is Lu. It is extremely reactive.Because of its high reactivity, it is a dangerous chemical. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. Electronic configuration: 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 5s 2 5p 6 6s 1 >> Back to key information about the elementBack to … Caesium has at least 39 known isotopes, which is more than any other element except francium.The atomic masses of these isotopes range from 112 to 151. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. The chemical symbol for Palladium is Pd. The chemical symbol for Rubidium is Rb. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. Technetium is the lightest element whose isotopes are all radioactive; none are stable. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. It may set itself on fire (ignite) in air. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. They give the standard measure of time: the electron resonance frequency of the caesium atom is 9,192,631,770 cycles per second. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Our Website follows all legal requirements to protect your privacy. To use electron affinities properly, it is essential to keep track of sign. Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. Nickel is a silvery-white lustrous metal with a slight golden tinge. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. Caesium was discovered by the German chemist Robert Wilhelm Bunsen and the German physicist Gustav Robert Kirchhoff in 1860. 4 Related Records Expand this section. An atom of an element in a compound will have a positive oxidation state if it has had electrons removed. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. Element reactions. Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. Elemental sulfur is a bright yellow crystalline solid at room temperature. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Note that, ionization energies measure the tendency of a neutral atom to resist the loss of electrons. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. Discoverer: McMillan, Edwin M. and Abelson, Philip H. Discoverer: Glenn T. Seaborg, Joseph W. Kennedy, Edward M. McMillan, Arthur C. Wohl, Discoverer: Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso, Discoverer: Glenn T. Seaborg, Ralph A. James, Albert Ghiorso, Discoverer: Stanley G. Thompson, Glenn T. Seaborg, Kenneth Street, Jr., Albert Ghiorso, Discoverer: Stanley G. Thompson, Glenn T. Seaborg, Bernard G. Harvey, Gregory R. Choppin, Albert Ghiorso, Discoverer: Albert Ghiorso, Glenn T. Seaborg, Torbørn Sikkeland, John R. Walton, Discoverer: Albert Ghiorso, Torbjørn Sikkeland, Almon E. Larsh, Robert M. Latimer, Copyright 2020 Periodic Table | All Rights Reserved |. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. Mass numbers of typical isotopes of Caesium are 133. The ground state electron configuration of ground state gaseous neutral caesium is [ Xe ]. It occurs on Earth as the decay product of various heavier elements. Similarly, adding electrons results in a negative oxidation state. Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure. Carbon is one of the few elements known since antiquity. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Its boiling point is the lowest among all the elements. When we write the configuration we'll put all 20 electrons in orbitals around the nucleus of the Calcium atom. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant. The chemical symbol for Indium is In. Electron Configuration. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. It is occasionally found in native form as elemental crystals. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. Discoverer: Davy, Sir H. and Thénard, L.-J. The chemical symbol for Caesium is Cs. Knowledge of the electron configuration of different atoms is useful in understanding the structure of the periodic table of elements. It is one of the least reactive chemical elements and is solid under standard conditions. Platinum is one of the least reactive metals. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. The chemical symbol for Yttrium is Y. Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a “rare-earth element”. The chemical symbol for Technetium is Tc. It must be noted, atoms lack a well-defined outer boundary. For example, carbon has nine possible integer oxidation states from −4 to +4. Czech version. It is fairly soft and slowly tarnishes in air. 5s 2 .5p x 2 .5p y 2 .5pz 2 . Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. 6s 1 Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. Most of the other isotopes have half-lives from a few days to fractions of a second. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. It is a noble metal and a member of the platinum group. The chemical symbol for Tantalum is Ta. Chemically, indium is similar to gallium and thallium. Pure radium is silvery-white alkaline earth metal. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom—the Na+ cation. Caesium and Rubidium) have exactly the same electron configuration. The chemical symbol for Platinum is Pt. Oxidation state 0 occurs for all elements – it is simply the element in its elemental form. 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