element types of tantalum diboride

tantalum diboride | element types

boron | tantalum

Periodic table location

Images

| boron | tantalum atomic symbol | B | Ta atomic number | 5 | 73 short electronic configuration | [He]2s^22p^1 | [Xe]6s^24f^145d^3 Aufbau diagram | 2p 2s | 5d 4f 6s block | p | d group | 13 | 5 period | 2 | 6 atomic mass | 10.81 u | 180.94788 u half-life | (stable) | (stable)

| boron | tantalum phase at STP | solid | solid melting point | 2075 °C | 3017 °C boiling point | 4000 °C | 5458 °C molar heat of fusion | 50 kJ/mol | 36 kJ/mol molar heat of vaporization | 507 kJ/mol | 735 kJ/mol specific heat at STP | 1030 J/(kg K) | 140 J/(kg K) (properties at standard conditions)

| boron | tantalum density | 2.46 g/cm^3 | 16.65 g/cm^3 liquid density | 2.08 g/cm^3 | 15 g/cm^3 molar volume | 4.394 cm^3/mol | 10.868 cm^3/mol Mohs hardness | 9.3 (between corundum and diamond) | 6.5 (between microcline and quartz) Vickers hardness | 49000 MPa | 873 MPa Brinell hardness | | 800 MPa bulk modulus | 320 GPa | 200 GPa shear modulus | | 69 GPa Young's modulus | | 186 GPa Poisson ratio | | 0.34 ultimate tensile strength | 2 MPa | sound speed | 16200 m/s | 3400 m/s thermal expansion | 6×10^-6 K^(-1) | 6.3×10^-6 K^(-1) thermal conductivity | 27 W/(m K) | 57 W/(m K) (properties at standard conditions)

| boron | tantalum electrical type | insulator | conductor resistivity | 10000 Ω m (ohm meters) | 1.3×10^-7 Ω m (ohm meters) electrical conductivity | 1×10^-4 S/m (siemens per meter) | 7.7×10^6 S/m (siemens per meter) magnetic type | diamagnetic | paramagnetic volume magnetic susceptibility | -2.14×10^-5 | 1.782×10^-4 mass magnetic susceptibility | -8.7×10^-9 m^3/kg (cubic meters per kilogram) | 1.07×10^-8 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | -9.41×10^-11 m^3/mol (cubic meters per mole) | 1.936×10^-9 m^3/mol (cubic meters per mole) work function | 4.45 eV (Polycrystalline) | (4 to 4.8) eV threshold frequency | 1.076×10^15 Hz (hertz) | (9.672×10^14 to 1.161×10^15) Hz (hertz) superconducting point | | 4.47 K (kelvins) color | (black) | (gray)

| boron | tantalum valence | 3 | 5 electronegativity | 2.04 | 1.5 electron affinity | 26.7 kJ/mol (kilojoules per mole) | 31 kJ/mol (kilojoules per mole) first ionization energy | 800.6 kJ/mol (kilojoules per mole) | 761 kJ/mol (kilojoules per mole) ionization energies | 800.6 kJ/mol | 2427.1 kJ/mol | 3659.7 kJ/mol | 25025.8 kJ/mol | 32826.7 kJ/mol | 761 kJ/mol | 1500 kJ/mol

Reactivity

| boron | tantalum term symbol | ^2P_(1/2) | ^4F_(3/2) atomic radius | 85 pm | 145 pm covalent radius | 84 pm | 170 pm (electronic ground state properties)

| boron | tantalum universe abundance | 1×10^-7 mass% | 8×10^-9 mass% solar abundance | 2×10^-7 mass% | meteorite abundance | 1.6×10^-4 mass% | 2×10^-6 mass% crust abundance | 8.6×10^-4 mass% | 1.7×10^-4 mass% ocean abundance | 4.4×10^-4 mass% | 2×10^-10 mass% human abundance | 7×10^-5 mass% | universe molar abundance | 1×10^-8 mol% | 6×10^-11 mol% solar molar abundance | 2×10^-8 mol% | meteorite molar abundance | 3×10^-4 mol% | 2×10^-7 mol% ocean molar abundance | 2.5×10^-4 mol% | 6.8×10^-12 mol% crust molar abundance | 0.0017 mol% | 1.9×10^-5 mol% human molar abundance | 4.1×10^-5 mol% |

| boron | tantalum half-life | (stable) | (stable) stable isotopes | B-11 (80.2%) | B-10 (19.8%) | Ta-181 (99.988%) nuclear spin | B-6: 2^- | B-7: 3/2^- | B-8: 2^+ | B-9: 3/2^- | B-10: 3^+ | B-11: 3/2^- | B-12: 1^+ | B-13: 3/2^- | B-14: 2^- | B-15: 3/2^- | B-16: 0^- | B-17: 3/2^- | B-18: 4^- | B-19: 3/2^- | Ta-155: 11/2^- | Ta-156: 2^- | Ta-157: 1/2^+ | Ta-158: 2^- | Ta-159: 1/2^- | Ta-160: 2^- | Ta-161: 1/2^+ | Ta-162: 3^+ | Ta-163: 1/2^+ | Ta-164: 3^+ | Ta-165: 5/2^- | Ta-166: 2^+ | Ta-167: 3/2^+ | Ta-169: 5/2^+ | Ta-170: 3^+ | Ta-171: 5/2^- | Ta-172: 3^+ | Ta-173: 5/2^- | Ta-174: 3^+ | Ta-175: 7/2^+ | Ta-176: 1^- | Ta-177: 7/2^+ | Ta-178: 7^- | Ta-179: 7/2^+ | Ta-180: 1^+ | Ta-181: 7/2^+ | Ta-182: 3^- | Ta-183: 7/2^+ | Ta-184: 5^- | Ta-185: 7/2^+ | Ta-187: 7/2^+ | Ta-189: 7/2^+ unstable isotopes | B-8 (770 ms) | B-12 (20.2 ms) | B-13 (17.33 ms) | B-14 (12.5 ms) | B-15 (9.93 ms) | B-17 (5.08 ms) | B-19 (2.92 ms) | B-18 (26 ns) | B-16 (190 ps) | B-9 (845 zs) | B-7 (0.33 zs) | Ta-179 (1.82 yr) | Ta-182 (114.43 days) | Ta-183 (120 h) | Ta-177 (56.56 h) | Ta-175 (10.5 h) | Ta-184 (8.6 h) | Ta-180 (8.1528 h) | Ta-176 (8.08 h) | Ta-173 (188 min) | Ta-178 (142 min) | Ta-174 (68 min) | Ta-185 (49.33 min) | Ta-172 (36.83 min) | Ta-171 (23 min) | Ta-186 (10.5 min) | Ta-170 (6.77 min) | Ta-169 (4.83 min) | Ta-187 (120 s) | Ta-168 (120 s) | Ta-167 (79.8 s) | Ta-166 (34.4 s) | Ta-165 (31 s) | Ta-188 (20 s) | Ta-164 (14.2 s) | Ta-163 (10.6 s) | Ta-162 (3.57 s) | Ta-189 (3 s) | Ta-161 (3 s) | Ta-160 (1.55 s) | Ta-159 (830 ms) | Ta-190 (300 ms) | Ta-156 (144 ms) | Ta-158 (55 ms) | Ta-157 (10.1 ms) | Ta-155 (13 µs) neutron cross-section | 760 b | 20.5 b neutron mass absorption | 2.4 m^2/kg | 0.0041 m^2/kg

| boron | tantalum CAS number | 7440-42-8 | 7440-25-7 PubChem CID number | 5462311 | 23956