The chemical symbol for Chromium is Cr. It occurs on Earth as the decay product of various heavier elements. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. 1) You may use almost everything for non-commercial and educational use. Boron has an average atomic mass of 10.81. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. ›› More information on molar mass and molecular weight. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. The atomic mass of an element is the weighted average of all of its isotopes. Name: Boron Symbol: B Atomic Number: 5 Atomic Mass: 10.811 amu Melting Point: 2300.0 °C (2573.15 K, 4172.0 °F) Boiling Point: 2550.0 °C (2823.15 K, 4622.0 °F) Number of Protons/Electrons: 5 Number of Neutrons: 6 Classification: Metalloid Crystal Structure: Rhombohedral Density @ 293 K: 2.34 g/cm 3 Color: brownish Atomic Structure Explain. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. Units of measure have been defined for mass and energy on the atomic scale to make measurements more convenient to express. Arsenic is a metalloid. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Neon is a chemical element with atomic number 10 which means there are 10 protons and 10 electrons in the atomic structure. 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. Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. Atomic mass of boron is 10.81. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. Technetium is the lightest element whose isotopes are all radioactive; none are stable. The chemical symbol for Carbon is C. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. Mass of an atom based on the mass of an atom of C-12 28.1 amu Silicon (Si) is made up of 92.23% 28Si (atomic mass 27.977 amu), 4.68% 29Si (atomic mass 28.976), and 3.09% 30Si (atomic mass 29.974). Pure germanium is a semiconductor with an appearance similar to elemental silicon. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. Boron-11 has a mass of 11.01 amu. The atom to which other atoms are compared to is usually called the standard. Francium is an alkali metal, that has one valence electron. Discoverer: McMillan, Edwin M. and Abelson, Philip H. Discoverer: Glenn T. Seaborg, Joseph W. Kennedy, Edward M. McMillan, Arthur C. Wohl, Discoverer: Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso, Discoverer: Glenn T. Seaborg, Ralph A. James, Albert Ghiorso, Discoverer: Stanley G. Thompson, Glenn T. Seaborg, Kenneth Street, Jr., Albert Ghiorso, Discoverer: Stanley G. Thompson, Glenn T. Seaborg, Bernard G. Harvey, Gregory R. Choppin, Albert Ghiorso, Discoverer: Albert Ghiorso, Glenn T. Seaborg, Torbørn Sikkeland, John R. Walton, Discoverer: Albert Ghiorso, Torbjørn Sikkeland, Almon E. Larsh, Robert M. Latimer, Copyright 2020 Periodic Table | All Rights Reserved |. There are 13 radioisotopes that have been discovered, with mass numbers from 7 to 21, all with short half-lives, the longest being that of 8 B, with a half-life of only 770 milliseconds (ms) and 12 B with a half-life of 20.2 ms. The chemical symbol for Lawrencium is Lr. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Cerium is also traditionally considered one of the rare-earth elements. 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. Lead is soft and malleable, and has a relatively low melting point. 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. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. Molar mass of B = 10.811 g/mol. Boron is a chemical element with atomic number 5 which means there are 5 protons in its nucleus.Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z.The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. So, the mass number of this boron isotope is equal to 11, and the atomic number to 5. One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. Look at the table of isotopes of boron, in particular the atomic mass units u. 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. The chemical symbol for Iron is Fe. Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. Ask your question. 2. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. 3 Chemical and Physical Properties Expand this section. 8 1 × 1 0 0 = 1 1. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. Compare your result to the atomic mass given in the periodic table. The chemical symbol for Nickel is Ni. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. The atomic mass is the mass of an atom. Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. - 15363571 The chemical symbol for Uranium is U. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. In this example, we calculate atomic abundance from atomic mass. The chemical symbol for Cobalt is Co. Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. A) Atomic masses are determined relative to an H–1 standard. Caesium has physical and chemical properties similar to those of rubidium and potassium. What is the relative mass of Boron? One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. Boron is a naturally-occurring chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. Under standard conditions, it is the lightest metal and the lightest solid element. Our Website follows all legal requirements to protect your privacy. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. The chemical symbol for Hafnium is Hf. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. It has a mass number of 10, as protons and neutron have a relative atomic mass of 1 each, and a neutral charge, as there are equal numbers of +1 protons and −1 electrons. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. 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