The chemical symbol for Lutetium is Lu. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. The chemical symbol for Copper is Cu. The chemical symbol for Mercury is Hg. It is a soft, silvery-white alkali metal. Units of measure have been defined for mass and energy on the atomic scale to make measurements more convenient to express. Silicon is a chemical element with atomic number 14 which means there are 14 protons and 14 electrons in the atomic structure. The chemical symbol for Gadolinium is Gd. The chemical symbol for Praseodymium is Pr. Bismuth is a chemical element with atomic number 83 which means there are 83 protons and 83 electrons in the atomic structure. Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. Uranium has the highest atomic weight of the primordially occurring elements. The chemical symbol for Uranium is U. Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. What is its mass number? It is one of the least reactive chemical elements and is solid under standard conditions. The chemical symbol for Ruthenium is Ru. Francium is an alkali metal, that has one valence electron. Neon is a chemical element with atomic number 10 which means there are 10 protons and 10 electrons in the atomic structure. The chemical symbol for Ytterbium is Yb. The chemical symbol for Dysprosium is Dy. Actinium is a soft, silvery-white radioactive metal. The chemical symbol for Arsenic is As. Start studying Periodic table (protons,neutrons,electrons). Mass numbers of typical isotopes of Astatine are 210. Determine the number of protons, neutrons and electrons in each and name them. All these three subatomic particles construct an atom. Radon is a radioactive, colorless, odorless, tasteless noble gas.    Halogens The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. Origin of Name: From the English word potash, meaning pot ashes, and the Arabic word qali, meaning alkali.The symbol K comes from the Latin word kalium, meaning alkali. Like all elements with atomic number over 100, lawrencium can only be produced in particle accelerators by bombarding lighter elements with charged particles. The chemical symbol for Rhodium is Rh. Its extreme rarity in the Earth’s crust, comparable to that of platinum. Atomic Mass: (210.0) amu. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Since nucleons (protons and neutrons) make up most of the mass of ordinary atoms, the density of normal matter tends to be limited by how closely we can pack these nucleons and depends on the internal atomic structure of a substance. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Very soft and malleable, indium has a melting point higher than sodium and gallium, but lower than lithium and tin. Isotopes are forms of the same element that differ in the number of neutrons but contain the same number of protons. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. The discovery of tennessine was officially announced in Dubna, Russia, by a Russian–American collaboration in April 2010, which makes it the most recently discovered element as of 2020. Halogens 8. The chemical symbol for Europium is Eu. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. What column and row in periodic table? The chemical symbol for Astatine is At . 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