Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. It is fairly soft and slowly tarnishes in air. Electronegativity, symbol χ, is a chemical property that describes the tendency of an atom to attract electrons towards this atom. Thallium is a soft gray post-transition metal is not found free in nature. Americium-241, the easiest to produce, has 146 neutrons. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. Americium is a Block F, Group 3, Period 7 element. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. The chemical symbol for Xenon is Xe. It is an intensive property, which is mathematically defined as mass divided by volume: Electron affinity of Americium is — kJ/mol. Nickel belongs to the transition metals and is hard and ductile. Major advantage of lead shield is in its compactness due to its higher density. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. 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. A freshly exposed surface of pure copper has a reddish-orange color. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. Atomic Number: 95. The chemical symbol for Palladium is Pd. Neodymium is a soft silvery metal that tarnishes in air. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. Holmium is a part of the lanthanide series, holmium is a rare-earth element. Oftentimes part of your answer will be right in front of you in the periodic table! Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure. Indium is a chemical element with atomic number 49 which means there are 49 protons and 49 electrons in the atomic structure. If you look at the periodic table, the atomic number of americium is 95, indicating that it has both 95 protons and 95 electrons. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. The nucleus is composed of protons and neutrons. Berkelium is a member of the actinide and transuranium element series. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. Problem 69 Smoke Detectors Americium-241, a radioisotope used in smoke detectors, is produced by bombarding plutonium-238 with neutrons to produce plutonium-240, which is bombarded with neutrons … Mercury is a chemical element with atomic number 80 which means there are 80 protons and 80 electrons in the atomic structure. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Caesium has physical and chemical properties similar to those of rubidium and potassium. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. The amount of americium in a typical new smoke detector is 0.29 microgram (about one-third the weight of a grain of sand) with an activity of 1 microcurie/37 kilobecquerels (1.0 μCi/37 kBq). Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure.
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