Tantalum is a hard blue-grey metallic transition element. Totally there are 36 isotopes of tantalum. Tantalum and niobium is found in columbite and tantalite and it is difficult to separate them. Mass Number of Tantalum. It is sometimes confused with tantalum. In addition to graded Z applications, tantalum is a good absorber of neutrons; there are several terrestrial applications for neutron shielding. It has 2 natural isotopes - Ta-181 and Ta-180m. Chemical Properties of Tantalum. Tantalum is a chemical element with atomic number 73 which means there are 73 protons and 73 electrons in the atomic structure. 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. These experimental results are augmented with neutron total-cross-section and additional neutron-scattering data from the literature to form a composite experimental database. 106 To find the neutron number, we subtract the proton number from its mass number. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. It reacts easily at high temperatures with oxygen, carbon, most halogens, nitrogen, and sulfur. It is a rare, soft, malleable, ductile, gray-white metal. The mass number is the top number in this case, which will be 179. Element Tantalum (Ta), Group 5, Atomic Number 73, d-block, Mass 180.948. Tantalum-181 Information. Its boiling point is 5,560 degrees Celsius. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. The chemical symbol for Tantalum is Ta . Mono-energetic neutrons are elastically and inelastically scattered from elemental tantalum at incident energies of ≈0.3–10.0 MeV. Mass numbers of typical isotopes of Tantalum are 181. Tantalum has 73 protons and electrons and its isotopes have 108 or 107 neutrons. This is approximately the sum of the number of protons and neutrons in the nucleus. Ta is tantalum on the periodic table, which has a proton number of 73. It is a very strong and durable metal. So, there are 179-73-106 neutrons in a ""^179Ta nuclide. 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; Fabrisonic is currently working with embedding tantalum for neutron shielding applications for nuclear medicine.  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. Where more than one isotope exists, the value given is the abundance weighted average. 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