These experimental results are augmented with neutron total-cross-section and additional neutron-scattering data from the literature to form a composite experimental database. Tantalum-181 Information. Ta is tantalum on the periodic table, which has a proton number of 73. Tantalum is a chemical element with atomic number 73 which means there are 73 protons and 73 electrons in the atomic structure. It reacts easily at high temperatures with oxygen, carbon, most halogens, nitrogen, and sulfur. It is a rare, soft, malleable, ductile, gray-white metal. So, there are 179-73-106 neutrons in a ""^179Ta nuclide. Where more than one isotope exists, the value given is the abundance weighted average. Tantalum is a hard blue-grey metallic transition element. This is approximately the sum of the number of protons and neutrons in the nucleus. Mass Number of Tantalum. Mono-energetic neutrons are elastically and inelastically scattered from elemental tantalum at incident energies of ≈0.3–10.0 MeV. The chemical symbol for Tantalum is Ta . It is a very strong and durable metal. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. It has 2 natural isotopes - Ta-181 and Ta-180m. 106 To find the neutron number, we subtract the proton number from its mass number. Number of Electrons (with no charge): 73; Number of Neutrons (most common/stable nuclide): 108; Number of Protons: 73; Oxidation States: 5; Valence Electrons: 5d 3 6s 2 Electron Dot Model. It is sometimes confused with tantalum. Tantalum has 73 protons and electrons and its isotopes have 108 or 107 neutrons. Mass numbers of typical isotopes of Tantalum are 181.  Tantalum is a transition metal in the 5th group with an atomic number of 73, a symbol of Ta, and an atomic number of 180 Its color is grey and its melting point is 3,020 degrees Celsius. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. The mass number is the top number in this case, which will be 179. Chemical Properties of Tantalum. Tantalum and niobium is found in columbite and tantalite and it is difficult to separate them. Fabrisonic is currently working with embedding tantalum for neutron shielding applications for nuclear medicine. Totally there are 36 isotopes of tantalum. In addition to graded Z applications, tantalum is a good absorber of neutrons; there are several terrestrial applications for neutron shielding. So, what even is Tantalum? Its boiling point is 5,560 degrees Celsius. Tantalum radioactive isotope number 1: 180 Ta: Neutrons: : 107; Abundance: : 0.012%; Jn: : 9-; Decay: : Unknown; t1/2: : 3.78432E+22s ≈ 1.200000e+15 y; The total number of neutrons in the nucleus of an atom is called the neutron number of the atom and is given the symbol N. Neutron number plus atomic number equals atomic mass number: N+Z=A. Element Tantalum (Ta), Group 5, Atomic Number 73, d-block, Mass 180.948. 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