The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. 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. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars.

Molybdenum does not occur natively, but is obtained principally from molybdenite. The chemical symbol for Europium is Eu. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. The chemical symbol for Polonium is Po. Europium is one of the least abundant elements in the universe. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. The chemical symbol for Lithium is Li.

Sodium is a soft, silvery-white, highly reactive metal. The name samarium is after the mineral samarskite from which it was isolated. Gold is a transition metal and a group 11 element. Molybdenum is found in the minerals molybdenite (MoS2) and wulfenite (MoO4Pb).


Periodic Table of the Elements. Only about 5×10−8% of all matter in the universe is europium. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. The chemical symbol for Curium is Cm. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. and Gay-Lussac, L.-J. The chemical symbol for Xenon is Xe. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. Its extreme rarity in the Earth’s crust, comparable to that of platinum. Major advantage of lead shield is in its compactness due to its higher density. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Lead is widely used as a gamma shield. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal.

Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. If you continue to use this site we will assume that you are happy with it. {Date of access}. The chemical symbol for Barium is Ba. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. 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 |.
It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. This WebElements periodic table page contains molybdenum pentachloride for the element molybdenum The chemical symbol for Samarium is Sm. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. 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 Francium is Fr.

In nuclear reactors, promethium equilibrium exists in power operation. Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure. is a rare earth element with a metallic silver luster. Molybdenum (Mo), chemical element, silver-gray refractory metal of Group 6 (VIb) of the periodic table, used to impart superior strength to steel and other alloys at high temperature. The chemical symbol for Niobium is Nb.

Actinium is a soft, silvery-white radioactive metal. Polonium is a rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. The chemical symbol for Rubidium is Rb. Molybdenum was discovered by Carl William Scheele (SE) in 1778.

Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. Periodic Table of Elements Element Molybdenum - Mo. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure.