Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. Method 1. Xenon is a colorless, dense, odorless noble gas found in the Earth’s atmosphere in trace amounts. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. Elemental sulfur is a bright yellow crystalline solid at room temperature. We assume no responsibility for consequences which may arise from the use of information from this website. One atomic mass unit is equal to 1.66 x 10-24 grams. Neon is a chemical element with atomic number 10 which means there are 10 protons and 10 electrons in the atomic structure. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Sodium is a soft, silvery-white, highly reactive metal. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. Why is melted paraffin was allowed to drop a certain height and not just rub over the skin? The chemical symbol for Tellurium is Te. CALCULATE THE PERCENTAGE of Br-79 atoms in a sample of bromine. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. Arsenic is a metalloid. Br belongs to the halogen family. It has an estimated density of 40.7 x 103 kg/m3. The chemical symbol for Antimony is Sb. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. The chemical symbol for Berkelium is Bk. Although classified as a rare earth element, samarium is the 40th most abundant element in the Earth’s crust and is more common than such metals as tin. For example, 63Cu (29 protons and 34 neutrons) has a mass number of 63 and an isotopic mass in its nuclear ground state is 62.91367 u. 1) You may use almost everything for non-commercial and educational use. Natural bromine is a mixture of two stable isotopes: bromine-79 (50.54 percent) and bromine-81 (49.46 percent). All Rights Reserved. Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). Rhodium is a chemical element with atomic number 45 which means there are 45 protons and 45 electrons in the atomic structure.

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