Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. uranium-235, and uranium-238. Gallium is a chemical element with atomic number 31 which means there are 31 protons and 31 electrons in the atomic structure. The chemical symbol for Astatine is At. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. Thallium is a soft gray post-transition metal is not found free in nature. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. An electrically neutral uranium-238 isotope contains 92 electrons, 92 protons and 146 neutrons (i.e. Titanium is a lustrous transition metal with a silver color, low density, and high strength. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. Then 1.30 remains available. The chemical symbol for Lawrencium is Lr. The chemical symbol for Californium is Cf. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. If there are too many or too few neutrons for a given number of protons, the resulting nucleus is not stable and it undergoes radioactive decay. Unstable isotopes decay through various radioactive decay pathways, most commonly alpha decay, beta decay, gamma decay or electron capture. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. 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. Neptunium is the first transuranic element. Chemically, indium is similar to gallium and thallium. Nickel is a silvery-white lustrous metal with a slight golden tinge. U-238 has 146 neutrons in the nucleus, but the number of neutrons can vary from 141 to 146. The bulk properties of astatine are not known with any certainty. Neutron number is rarely written explicitly in nuclide symbol notation, but appears as a subscript to the right of the element symbol. The chemical symbol for Curium is Cm. 238 U has the longest half–life of the three isotopes (4.5 billion years), making it the least radioactive isotope and the isotope most likely to cause chemical toxicity rather than radiation injury. 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. Although neodymium is classed as a rare earth, it is a fairly common element. The chemical symbol for Helium is He. The chemical symbol for Fluorine is F. Fluorine is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. The chemical symbol for Promethium is Pm. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. Lawrencium is the final member of the actinide series. To identify the stability of an isotope it is needed to find the ratio of neutrons to protons. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. Atomic nuclei consist of protons and neutrons, which attract each other through the nuclear force, while protons repel each other via the electric force due to their positive charge. According to the Einstein relationship (E=mc2), this binding energy is proportional to this mass difference and it is known as the mass defect. By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. For example, actinides with odd neutron number are usually fissile (fissionable with slow neutrons) while actinides with even neutron number are usually not fissile (but are fissionable with fast neutrons). The chemical symbol for Uranium is U. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. Lead is a heavy metal that is denser than most common materials. The number of neutrons equals the atomic weight minus the number of protons (238 - 92 = 146).Uranium has 92 protons, 92 electrons, and usually 147 neutrons, though another isotope has 143 neutrons. It is even less abundant than the so-called rare earths. Xenon is a colorless, dense, odorless noble gas found in the Earth’s atmosphere in trace amounts. The size and mass of atoms are so small that the use of normal measuring units, while possible, is often inconvenient. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps. The chemical symbol for Krypton is Kr. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. The chemical symbol for Einsteinium is Es. The chemical symbol for Europium is Eu. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. The chemical symbol for Selenium is Se. 238U occasionally decays by spontane… Titanium can be used in surface condensers. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. It can be observed from the chart that there are more neutrons than protons in nuclides with Z greater than about 20 (Calcium). The chemical symbol for Osmium is Os. Join now. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. The chemical symbol for Xenon is Xe. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. The chemical symbol for Copper is Cu. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles. U-238 is the most abundant uranium followed by U-U- 235 and 234. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. e = 92, p = 92, n = 146). Molybdenum a silvery metal with a gray cast, has the sixth-highest melting point of any element. Carbon is one of the few elements known since antiquity. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. Properties of atomic nuclei (atomic mass, nuclear cross-sections) are determined by the number of protons and number of neutrons (neutron number). Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor. The chemical symbol for Mercury is Hg. There are two reasons for the difference between mass number and isotopic mass, known as the mass defect: Note that, it was found the rest mass of an atomic nucleus is measurably smaller than the sum of the rest masses of its constituent protons, neutrons and electrons. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. uranium-238 is the most abundant uranium isotope. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. The chemical symbol for Fermium is Fm. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. 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