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. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. We use cookies to ensure that we give you the best experience on our website. Nuclides that have the same neutron number but a different proton number are called isotones. The biological half-life of rubidium is around 50 days. © 2019 periodic-table.org / see also (1969), Discoverer: Scientists at Dubna, Russia (1967)/Lawrence Berkeley Laboratory (1970), Discoverer: Armbruster, Paula and Muenzenberg, Dr. Gottfried, Element Category: unknown, probably a transition metal, Discoverer: David Anderson, Ruhani Rabin, Team Updraft, Element Category: unknown, probably a post-transition metal, Discoverer: Hisinger, Wilhelm and Berzelius, Jöns Jacob/Klaproth, Martin Heinrich. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. We can determine the neutron number of certain isotope. The chemical symbol for Fermium is Fm. Titanium condenser tubes are usually the best technical choice, however titanium is very expensive material. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). For 12C the atomic mass is exactly 12u, since the atomic mass unit is defined from it. Titanium is a lustrous transition metal with a silver color, low density, and high strength. The chemical symbol for Iodine is I. Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. Elemental sulfur is a bright yellow crystalline solid at room temperature. A freshly exposed surface of pure copper has a reddish-orange color. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. Lead is soft and malleable, and has a relatively low melting point. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. Mercury is commonly known as quicksilver and was formerly named hydrargyrum. Neptunium metal is silvery and tarnishes when exposed to air. The chemical symbol for Ruthenium is Ru. Berkelium is a member of the actinide and transuranium element series. It is an intensive property, which is mathematically defined as mass divided by volume: In words, the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. Thulium is an easily workable metal with a bright silvery-gray luster. The chemical symbol for Caesium is Cs. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. It is even less abundant than the so-called rare earths. For 12C the atomic mass is exactly 12u, since the atomic mass unit is defined from it. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. Radon is a radioactive, colorless, odorless, tasteless noble gas. Since all the elements in the first group of periodic table are alkali metals, rubidium is also an alkali metal. Nickel is a silvery-white lustrous metal with a slight golden tinge. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Each nuclide is denoted by chemical symbol of the element (this specifies Z) with tha atomic mass number as supescript. Element Rubidium (Rb), Group 1, Atomic Number 37, s-block, Mass 85.468. The chemical symbol for Rubidium is Rb. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. Main purpose of this project is to help the public learn some interesting and important information about the peaceful uses of nuclear energy. Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. Holmium is a relatively soft and malleable silvery-white metal. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. The more abundant an isotope is, the more its atomic mass will influence the average atomic mass of the element. 1) You may use almost everything for non-commercial and educational use. The information contained in this website is for general information purposes only. The chemical symbol for Helium is He. The chemical symbol for Nickel is Ni. The chemical symbol for Terbium is Tb. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Calculate the atomic mass for rubidium using the weighted average mass method. The chemical symbol for Hafnium is Hf. Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten. Lead is widely used as a gamma shield. The chemical symbol for Titanium is Ti. Very soft and malleable, indium has a melting point higher than sodium and gallium, but lower than lithium and tin. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). The chemical symbol for Berkelium is Bk. R75-1 (27.2895 eV) Ref. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant. 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. Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. The chemical symbol for Lead is Pb. 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. The densest material found on earth is the metal osmium, but its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. The chemical symbol for Germanium is Ge. Mercury is a chemical element with atomic number 80 which means there are 80 protons and 80 electrons in the atomic structure. 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. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. The chemical symbol for Beryllium is Be. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. The chemical symbol for Molybdenum is Mo. Calculate the average atomic mass of rubidium… Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z. Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife.