Nuclides that have the same neutron number but a different proton number are called isotones. The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. Under standard conditions, it is the lightest metal and the lightest solid element. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. Atomic Number – Protons, Electrons and Neutrons in Rhodium. 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 chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles. The history of the discovery of the isotopes of platinum, made over some 61 years between 1935 and 1996, can be gleaned from the various editions of the monograph “Table of Isotopes” (1–8). (1) the same number of protons and the same number of neutrons (2) the same number of protons but a different number of neutrons (3) a different number of protons but the same number of neutrons (4) a different number of protons and a different number of neutrons 4 The element in Group 14, Period 3, of the Periodic Table is classifi ed as a Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure. The chemical symbol for Bromine is Br. It is a noble metal and a member of the platinum group. However, except for a few cases, in general, little attempt has been made to correlate the circumstances of the discoveries of the isotopes of individual elements. Used by the pre-Columbian Indians of South America, platinum wasn't noticed by western scientists until 1735. Major advantage of lead shield is in its compactness due to its higher density. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. Tantalum has about 103 neutrons and has 73 protons and electrons. One effect is that there are few stable odd–odd nuclides: in fact only five are stable, with another four having half-lives longer than a billion years. The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis. 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. One mole of 235 U has a mass of 235.04 g; thus, there are (1000 g)/(235.04 g/mol) = 4.25 mol. But what about its neutrons? Pure radium is silvery-white alkaline earth metal. Density is defined as the mass per unit volume. Platinum is a chemical element with the symbol Pt and atomic number 78. Density: 16.4 grams per cubic centimeter: Mass/volume. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. The chemical symbol for Mercury is Hg. Atomic number also determines the element’s location on the periodic table. It is a soft, silvery-white alkali metal. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. The chemical symbol for Tantalum is Ta. This is a diagram of an atom of platinum showing the nucleus and the electrons in orbitals. Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. The chemical symbol for Ytterbium is Yb. The chemical symbol for Uranium is U. The chemical symbol for Rubidium is Rb. 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