Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. Sodium is a soft, silvery-white, highly reactive metal. Uranium is a silvery-white metal in the actinide series of the periodic table. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. The chemical symbol for Silicon is Si. The chemical symbol for Boron is B. The chemical symbol for Molybdenum is Mo. Specific heat capacity is the amount of energy needed to change the temperature of a kilogram of a substance by 1 K. A measure of the stiffness of a substance. High = substitution not possible or very difficult. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. Selenium is a chemical element with the symbol Se and atomic number 34. The atomic number of a chemical element is the number of protons found in the nucleus of the atom of that element. Selenium is a chemical element with the symbol Se and atomic number 34. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. Most of the world’s selenium is obtained from the anode muds produced during the electrolytic refining of copper. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Elemental sulfur is a bright yellow crystalline solid at room temperature. The element symbol of selenium is Se. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. In nuclear reactors, promethium equilibrium exists in power operation. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. The chemical symbol for Cerium is Ce. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. You may browse, download or print out one copy of the material displayed on the Site for your personal, non-commercial, non-public use, but you must retain all copyright and other proprietary notices contained on the materials. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present). Cerium is the second element in the lanthanide series. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium). The percentage of the world reserves located in the country with the largest reserves. Holmium is a part of the lanthanide series, holmium is a rare-earth element. It is located in Group 16 of the periodic table. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … 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 |. In nuclear industry, especially artificial xenon 135 has a tremendous impact on the operation of a nuclear reactor. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. Einsteinium is the seventh transuranic element, and an actinide. Neptunium metal is silvery and tarnishes when exposed to air. Properties: Selenium has an atomic radius of 117 pm, a melting point of 220.5°C, boiling point of 685°C, with oxidation states of 6, 4, and -2. Arsenic is a metalloid. The ordering of the electrons in the ground state of multielectron atoms, starts with the lowest energy state (ground state) and moves progressively from there up the energy scale until each of the atom’s electrons has been assigned a unique set of quantum numbers. Chemically, indium is similar to gallium and thallium. In excess it is carcinogenic and teratogenic (disturbs the development of an embryo or foetus). The name is derived from 'selene', the Greek name for the Moon. It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system. Where more than one isotope exists, the value given is the abundance weighted average. Selenium was discovered by Jöns Jacob Berzelius (SE) in 1817. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … Step-2: We know that the atomic number of selenium is 34.So selenium has 34 protons and 34 electrons as the charge of electrons and protons are equal but opposite in nature.The charge of proton is +1 and the charge of electron is -1. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. Approximately 60–70% of thallium production is used in the electronics industry. Its primary use is in alloys and in glass production. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. Selenium (34 Se) has six natural isotopes that occur in significant quantities, along with the trace isotope 79 Se, which occurs in minute quantities in uranium ores. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. The chemical symbol for Iodine is I. Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. In fact their absorption cross-sections are the highest among all stable isotopes. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. If you are in any doubt, please ask. Relative atomic mass An integrated supply risk index from 1 (very low risk) to 10 (very high risk). Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. Astatine is the rarest naturally occurring element on the Earth’s crust. All such documents and related graphics are provided "as is" without any representation or endorsement made and warranty of any kind, whether expressed or implied, including but not limited to the implied warranties of fitness for a particular purpose, non-infringement, compatibility, security and accuracy. The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. Atomic weight of Selenium is 78.971 u or g/mol. Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. Selenium is a metallic gray chemical element with an atomic number of 34. Its primary use is in alloys and in glass production. A measure of the propensity of a substance to evaporate. Melting point 494K. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure. You do not have JavaScript enabled. The chemical symbol for Rhenium is Re. Nor shall the RSC be in any event liable for any damage to your computer equipment or software which may occur on account of your access to or use of the Site, or your downloading of materials, data, text, software, or images from the Site, whether caused by a virus, bug or otherwise. Element Classification: Non-metal. It can also convert AC electricity to DC electricity, so is extensively used in rectifiers. Actinium is a soft, silvery-white radioactive metal. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. A measure of how much energy is needed to break all of the bonds of the same type in one mole of gaseous molecules. The chemical symbol for Indium is In. The atomic number of each element increases by one, reading from left to right. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. The mass of an atom relative to that of carbon-12. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. What is Atomic Number Density - Definition. A semi-metal that can exist in two forms: as a silvery metal or as a red powder. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. Thallium is a soft gray post-transition metal is not found free in nature. It is therefore useful in photocells, solar cells and photocopiers. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Again, this requires great care. It has 34 protons and 34 electrons and a mass number of 78.96. Atomic number Selenium chemical element. Its chemical symbol is Se and its atomic number is 34. Selenium in its allotropic red form is added to glass to give it a scarlet color, but it also can be used to remove the greenish tint sometimes found in glass due to iron compounds. Titanium condenser tubes are usually the best technical choice, however titanium is very expensive material. Properties of Selenium-74 Isotope: SELENIUM-74; Natural Abundance (%) 0.86: Atomic Mass (Da) 73.9224764: Relative Isotopic Mass: 73.9224764: Neutron Number (N) It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. 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. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. 34. He also became affected by it personally – it can be absorbed through the skin – and it caused him to experience the bad breath associated with those who work with this element. Discoverer: Corson, Dale R. and Mackenzie, K. R. The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. Gold is a transition metal and a group 11 element. The chemical symbol for Plutonium is Pu. Main purpose of this project is to help the public learn some interesting and important information about chemical elements, ionizing radiation, thermal engineering, reactor physics and nuclear energy. Its electronic configuration is 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 4 or it can be written as [Ar] 3d 10 4s 2 4p 4. In a neutral atom there are as many electrons as protons moving about nucleus. Chlorine is a yellow-green gas at room temperature. We know selenium is there, right under sulfur, in the periodic table, but it doesn't get much attention. Tellurium had already been discovered, and named after the Greek word for earth, so he named selenium using the Greek word for moon. Selenium is found in a few rare minerals. 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