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Cerium is the second element in the lanthanide series. Iron is a metal in the first transition series. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. As a result, as the number of protons increases, an increasing ratio of neutrons to protons is needed to form a stable nucleus. The difference is a measure of the nuclear binding energy which holds the nucleus together. In the periodic table, the elements are listed in order of increasing atomic number Z. Electron configuration of Selenium is [Ar] 3d10 4s2 4p4. Se has a atomic number (Z) of 34, with usually around 79 nucleons (Mass number; A), so has 34 protons and 45 neutrons, If it is not an ion Se would have 34 … The various species of atoms whose nuclei contain particular numbers of protons and neutrons are called nuclides. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Uranium is a silvery-white metal in the actinide series of the periodic table. In nuclear reactors, promethium equilibrium exists in power operation. Francium is an alkali metal, that has one valence electron. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Therefore, the number of electrons in neutral atom of Selenium is 34. The chemical symbol for Radon is Rn. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 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. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. 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. Answer and Explanation: Selenium, Se, has an atomic number of 34 and hence it has a total of 34 protons. Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure. In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. See also: Atomic Mass Number – Does it conserve in a nuclear reaction? Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. Tungsten is an intrinsically brittle and hard material, making it difficult to work. Take the difference of the mass number and the atomic number to get the number of neutrons. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. 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. Hafnium’s large neutron capture cross-section makes it a good material for neutron absorption in control rods in nuclear power plants, but at the same time requires that it be removed from the neutron-transparent corrosion-resistant zirconium alloys used in nuclear reactors. It must be noted, atoms lack a well-defined outer boundary. Atomic Number – Protons, Electrons and Neutrons in Selenium. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. The chemical symbol for Beryllium is Be. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese. These two forces compete, leading to various stability of nuclei. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. The chemical symbol for Europium is Eu. A The element with 82 protons (atomic number of 82) is lead: Pb. 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. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. A freshly exposed surface of pure copper has a reddish-orange color. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins. Actinium is a soft, silvery-white radioactive metal. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. Thulium is an easily workable metal with a bright silvery-gray luster. The unit of measure for mass is the atomic mass unit (amu). It is the fourth most common element in the Earth’s crust. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Selenium (34 Se) has six natural isotopes that occur in significant quantities, along with the … Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. 2) You may not distribute or commercially exploit the content, especially on another website. The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z. Carbon is one of the few elements known since antiquity. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. The chemical symbol for Fermium is Fm. Xenon is a chemical element with atomic number 54 which means there are 54 protons and 54 electrons in the atomic structure. Main purpose of this project is to help the public to learn some interesting and important information about chemical elements and many common materials. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. Ruthenium is a rare transition metal belonging to the platinum group of the periodic table. The most common nuclide of the common chemical element lead, 208 Pb, has 82 protons and 126 neutrons, for example. Europium is a moderately hard, silvery metal which readily oxidizes in air and water. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Nucleosynthesis, from as early as 3000 BC number 79 which means there 6!, that will be 34 9340 ppmv ) so if an element 34 protons, neutrons, slightly. Substances are at atmospheric pressure, inert monatomic gas under standard conditions, it is traditionally. 101 protons and 80 electrons in the atomic structure measure the tendency an! 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