scandium, chromium

scandium (chemical element) | chromium (chemical element)

Periodic table location

Images

| scandium | chromium atomic symbol | Sc | Cr atomic number | 21 | 24 short electronic configuration | [Ar]4s^23d^1 | [Ar]4s^13d^5 Aufbau diagram | 3d 4s | 3d 4s block | d | d group | 3 | 6 period | 4 | 4 atomic mass | 44.955908 u | 51.9961 u half-life | (stable) | (stable)

| scandium | chromium phase at STP | solid | solid melting point | 1541 °C | 1907 °C boiling point | 2830 °C | 2671 °C molar heat of fusion | 16 kJ/mol | 20.5 kJ/mol molar heat of vaporization | 318 kJ/mol | 339 kJ/mol specific heat at STP | 567 J/(kg K) | 448 J/(kg K) Néel point | | 393 K (properties at standard conditions)

| scandium | chromium density | 2.985 g/cm^3 | 7.19 g/cm^3 liquid density | 2.8 g/cm^3 | 6.3 g/cm^3 molar volume | 15.06 cm^3/mol | 7.232 cm^3/mol Mohs hardness | | 8.5 (between topaz and corundum) Vickers hardness | | 1060 MPa Brinell hardness | 750 MPa | 1120 MPa bulk modulus | 57 GPa | 160 GPa shear modulus | 29 GPa | 115 GPa Young's modulus | 74 GPa | 279 GPa Poisson ratio | 0.28 | 0.21 tensile yield strength | 173 MPa | ultimate tensile strength | 255 MPa | sound speed | | 5940 m/s thermal expansion | 1.02×10^-5 K^(-1) | 4.9×10^-6 K^(-1) thermal conductivity | 16 W/(m K) | 94 W/(m K) (properties at standard conditions)

| scandium | chromium electrical type | conductor | conductor resistivity | 5.5×10^-7 Ω m (ohm meters) | 1.3×10^-7 Ω m (ohm meters) electrical conductivity | 1.8×10^6 S/m (siemens per meter) | 7.9×10^6 S/m (siemens per meter) magnetic type | paramagnetic | antiferromagnetic volume magnetic susceptibility | 2.627×10^-4 | 3.177×10^-4 mass magnetic susceptibility | 8.8×10^-8 m^3/kg (cubic meters per kilogram) | 4.45×10^-8 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 3.956×10^-9 m^3/mol (cubic meters per mole) | 2.314×10^-9 m^3/mol (cubic meters per mole) Néel point | | 393 K (kelvins) work function | 3.5 eV (Polycrystalline) | 4.5 eV (Polycrystalline) threshold frequency | 8.463×10^14 Hz (hertz) | 1.088×10^15 Hz (hertz) superconducting point | 0.05 K (kelvins) | color | (silver) | (silver)

| scandium | chromium valence | 3 | 6 electronegativity | 1.36 | 1.66 electron affinity | 18.1 kJ/mol (kilojoules per mole) | 64.3 kJ/mol (kilojoules per mole) first ionization energy | 633.1 kJ/mol (kilojoules per mole) | 652.9 kJ/mol (kilojoules per mole) ionization energies | 633.1 kJ/mol | 1235 kJ/mol | 2388.6 kJ/mol | 7090.6 kJ/mol | 8843 kJ/mol | 10679 kJ/mol | 13310 kJ/mol | 15250 kJ/mol | 17370 kJ/mol | 21726 kJ/mol | 24102 kJ/mol | 66320 kJ/mol | 73010 kJ/mol | 80160 kJ/mol | 89490 kJ/mol | 97400 kJ/mol | 105600 kJ/mol | 117000 kJ/mol | 124270 kJ/mol | 547530 kJ/mol | 582163 kJ/mol | 652.9 kJ/mol | 1590.6 kJ/mol | 2987 kJ/mol | 4743 kJ/mol | 6702 kJ/mol | 8744.9 kJ/mol | 15455 kJ/mol | 17820 kJ/mol | 20190 kJ/mol | 23580 kJ/mol | 26130 kJ/mol | 28750 kJ/mol | 34230 kJ/mol | 37066 kJ/mol | 97510 kJ/mol | 105800 kJ/mol | 114300 kJ/mol | 125300 kJ/mol | 134700 kJ/mol | 144300 kJ/mol | 157700 kJ/mol

Reactivity

| scandium | chromium term symbol | ^2D_(3/2) | ^7S_3 atomic radius | 160 pm | 140 pm covalent radius | 170 pm | 139 pm (electronic ground state properties)

| scandium | chromium universe abundance | 3×10^-6 mass% | 0.0015 mass% solar abundance | 4×10^-6 mass% | 0.002 mass% meteorite abundance | 6.4×10^-4 mass% | 0.3 mass% crust abundance | 0.0026 mass% | 0.014 mass% ocean abundance | 1.5×10^-10 mass% | 6×10^-8 mass% human abundance | | 3×10^-6 mass% universe molar abundance | 1×10^-7 mol% | 4×10^-5 mol% solar molar abundance | 9.9×10^-8 mol% | 4×10^-5 mol% meteorite molar abundance | 2.9×10^-4 mol% | 0.12 mol% ocean molar abundance | 2.1×10^-11 mol% | 7.1×10^-9 mol% crust molar abundance | 0.0012 mol% | 0.0055 mol% human molar abundance | | 4×10^-7 mol%

| scandium | chromium half-life | (stable) | (stable) stable isotopes | Sc-45 (100%) | Cr-52 (83.789%) | Cr-53 (9.501%) | Cr-50 (4.345%) | Cr-54 (2.365%) nuclear spin | Sc-37: 7/2^- | Sc-38: 2^- | Sc-39: 7/2^- | Sc-40: 4^- | Sc-41: 7/2^- | Sc-42: 0^+ | Sc-43: 7/2^- | Sc-44: 2^+ | Sc-45: 7/2^- | Sc-46: 4^+ | Sc-47: 7/2^- | Sc-48: 6^+ | Sc-49: 7/2^- | Sc-50: 5^+ | Sc-51: 7/2^- | Sc-52: 3^+ | Sc-53: 7/2^- | Sc-55: 7/2^- | Sc-56: 1^~ | Sc-57: 7/2^- | Sc-58: 3^+ | Sc-59: 7/2^- | Sc-60: 3^+ | Cr-42: 0^+ | Cr-43: 3/2^+ | Cr-44: 0^+ | Cr-45: 7/2^- | Cr-46: 0^+ | Cr-47: 3/2^- | Cr-48: 0^+ | Cr-49: 5/2^- | Cr-50: 0^+ | Cr-51: 7/2^- | Cr-52: 0^+ | Cr-53: 3/2^- | Cr-54: 0^+ | Cr-55: 3/2^- | Cr-56: 0^+ | Cr-58: 0^+ | Cr-59: 1/2^- | Cr-60: 0^+ | Cr-61: 5/2^- | Cr-62: 0^+ | Cr-63: 1/2^- | Cr-64: 0^+ | Cr-65: 1/2^- | Cr-66: 0^+ | Cr-67: 1/2^- unstable isotopes | Sc-46 (83.78 days) | Sc-47 (80.3806 h) | Sc-48 (43.67 h) | Sc-44 (3.97 h) | Sc-43 (3.8917 h) | Sc-49 (57.17 min) | Sc-50 (102.5 s) | Sc-51 (12.4 s) | Sc-52 (8.2 s) | Sc-53 (3 s) | Sc-42 (681.3 ms) | Sc-41 (596.3 ms) | Sc-54 (360 ms) | Sc-40 (182.3 ms) | Sc-55 (105 ms) | Sc-56 (35 ms) | Sc-57 (13 ms) | Sc-58 (12 ms) | Sc-59 (10 ms) | Sc-60 (3 ms) | Sc-39 (300 ns) | Sc-38 (300 ns) | Cr-51 (27.703 days) | Cr-48 (21.561 h) | Cr-49 (42.33 min) | Cr-56 (5.93 min) | Cr-55 (209.8 s) | Cr-57 (21.1 s) | Cr-58 (7 s) | Cr-60 (570 ms) | Cr-47 (500 ms) | Cr-59 (460 ms) | Cr-61 (270 ms) | Cr-46 (260 ms) | Cr-62 (190 ms) | Cr-63 (129 ms) | Cr-45 (60.9 ms) | Cr-44 (53 ms) | Cr-64 (43 ms) | Cr-65 (27 ms) | Cr-43 (21.6 ms) | Cr-42 (13 ms) | Cr-67 (10 ms) | Cr-66 (10 ms) neutron cross-section | 27.2 b | 3.1 b neutron mass absorption | 0.025 m^2/kg | 0.0021 m^2/kg

| scandium | chromium CAS number | 7440-20-2 | 7440-47-3 PubChem CID number | 23952 | 23976