Isotopes: Americium has 14 isotopes whose half-lives are known, with mass numbers 232 to 247. Americium is a Block F, Group 3, Period 7 element. the number of neutrons in a nucleus. The periodic table lists the atomic weight for each element, which can be used to find mass number, For hydrogen, for example, the atomic weight is 1.008. Total world production is probably around a few kilograms per year. the number of neutrons in a nucleus. Americium (chemical symbol Am) is a man-made radioactive metal that is solid under normal conditions. They produced americium by bombarding plutonium-239, an isotope of plutonium, with high energy neutrons.This formed plutonium-240, which was itself bombarded with neutrons. 242 Cm 96. To find the number of neutrons in an atom, you need to find the mass number for each element. Thank you! [3] (The isotope americium-243 also decays by α emission and is longer-lived at 7370 years, but it is obtained by irradiating americium-241 with neutrons so it is more expensive.) The number of electrons in each of Americium's shells is 2, 8, 18, 32, 25, 8, 2 and its electron configuration is [Rn] 5f 7 7s 2.The americium atom has a radius of 173.pm and its Van der Waals radius is 244.pm. Americium has 18 isotopes in the range of atomic masses 231 to 249; the number of neutrons is the difference between the atomic mass and the atomic number (for Am is 95). Its longest lived isotopes are 243 Am, with a half-life of 7370 years, 241 Am with a half-life of 432.2 years and 242 Am with a half-life of 141 years. Commonly employed units for this quantity are n/cm2/s (i.e., cm-2 s-1). Americium-241 is the most common form of Americium. Name: Tellurium Symbol: Te Atomic Number: 52 Atomic Mass: 127.6 Number of Protons/Electrons: 52 Number of Neutrons: 76 Classification: Metalloids Discovery: 1782 Discoverer: Franz Muller von Reichenstein Radioactive americium-241 is used in household smoke detectors and in bone mineral analysis. Americium is produced when plutonium absorbs neutrons in nuclear reactors or during nuclear weapons tests. Americium was discovered in 1944 by the American scientists Glenn T. Seaborg, Ralph A. James, Leon O. Morgan and Albert Ghiorso. Find the Number of Neutrons . Sources of Americium: Produced by bombarding plutonium with neutrons. • The neutron fluence rate (N) is the number of neutrons that pass through a specified area per unit time. Uses of Americium: In the past Americium was used as a source of radiation for radiography. Americium Properties. The isotope of americium used in smoke detectors is americium-241, which decays by α emission to neptunium-237 with a half-life of 432.2 years. Americium is an atom not a molecule.Americium-241 has: 95 protons, 95 electrons, 146 neutrons.For other isotopes the number of neutrons is different.Number of neutrons = Mass number of an isotope - 95 Americium-238 and plutonium-238 To find the number of neutrons, subtract the number of protons (the number at the bottom) from the number of protons and neutrons (the number at the top). The direction of the neutrons … Americium has no naturally occurring isotopes. Additional Notes: Americium is normally never encountered out side of … Americium. When Americium-242 loses a beta particle the product of this process is: 242 Pu 94 243 Cm 96 242 Cm 96 241 Pu 94. Number of Neutrons: 14 Classification: Metalloids Discovery: 1823 Discoverer: Jons Berzelius Uses: glass. Give the number of electrons, protons, and neutrons in an atom of americium-241. Bombarding plutonium with neutrons the number of neutrons: 14 Classification: Metalloids Discovery 1823. 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