erbium vs actinium

erbium (chemical element) | actinium (chemical element)

Periodic table location

Images

| erbium | actinium atomic symbol | Er | Ac atomic number | 68 | 89 short electronic configuration | [Xe]6s^24f^12 | [Rn]7s^26d^1 Aufbau diagram | 4f 6s | 6d 7s block | f | f period | 6 | 7 atomic mass | 167.259 u | 227 u half-life | (stable) | 21.787 yr

| erbium | actinium phase at STP | solid | solid melting point | 1497 °C | 1050 °C boiling point | 2868 °C | 3200 °C molar heat of fusion | 19.9 kJ/mol | 14 kJ/mol molar heat of vaporization | 285 kJ/mol | 400 kJ/mol specific heat at STP | 168 J/(kg K) | 120 J/(kg K) Néel point | 82 K | (properties at standard conditions)

| erbium | actinium density | 9.066 g/cm^3 | 10.07 g/cm^3 liquid density | 8.86 g/cm^3 | molar volume | 18.45 cm^3/mol | 22.5 cm^3/mol Mohs hardness | 2 (between gypsum and talc) | Vickers hardness | 589 MPa | Brinell hardness | 814 MPa | bulk modulus | 44 GPa | shear modulus | 28 GPa | Young's modulus | 70 GPa | Poisson ratio | 0.24 | tensile yield strength | 60 MPa | ultimate tensile strength | 136 MPa | sound speed | 2830 m/s | thermal expansion | 1.22×10^-5 K^(-1) | thermal conductivity | 15 W/(m K) | 12 W/(m K) (properties at standard conditions)

| erbium | actinium electrical type | conductor | resistivity | 8.6×10^-7 Ω m (ohm meters) | electrical conductivity | 1.2×10^6 S/m (siemens per meter) | magnetic type | paramagnetic | volume magnetic susceptibility | 0.0341788 | mass magnetic susceptibility | 3.77×10^-6 m^3/kg (cubic meters per kilogram) | molar magnetic susceptibility | 6.30566×10^-7 m^3/mol (cubic meters per mole) | Curie point | 32 K (kelvins) | Néel point | 82 K (kelvins) | color | (silver) | (silver)

| erbium | actinium valence | 3 | 3 electronegativity | 1.24 | 1.1 electron affinity | 50 kJ/mol (kilojoules per mole) | first ionization energy | 589.3 kJ/mol (kilojoules per mole) | 499 kJ/mol (kilojoules per mole) ionization energies | 589.3 kJ/mol | 1150 kJ/mol | 2194 kJ/mol | 4120 kJ/mol | 499 kJ/mol | 1170 kJ/mol

Reactivity

| erbium | actinium term symbol | ^3H_6 | ^2D_(3/2) atomic radius | 175 pm | 195 pm covalent radius | 189 pm | 215 pm (electronic ground state properties)

| erbium | actinium universe abundance | 2×10^-7 mass% | solar abundance | 1×10^-7 mass% | 0 mass% meteorite abundance | 1.8×10^-5 mass% | crust abundance | 3×10^-4 mass% | ocean abundance | 9×10^-11 mass% | human abundance | | 0 mass% universe molar abundance | 1×10^-9 mol% | solar molar abundance | 9.9×10^-10 mol% | 0 mol% meteorite molar abundance | 2×10^-6 mol% | ocean molar abundance | 3.3×10^-12 mol% | crust molar abundance | 3.7×10^-5 mol% | human molar abundance | | 0 mol%

| erbium | actinium half-life | (stable) | 21.787 yr specific radioactivity | | 2.676 TBq/g decay mode | | beta decay stable isotopes | Er-166 (33.503%) | Er-168 (26.978%) | Er-167 (22.869%) | Er-170 (14.91%) | Er-164 (1.601%) | Er-162 (0.139%) | nuclear spin | Er-143: 9/2^- | Er-144: 0^+ | Er-145: 1/2^+ | Er-146: 0^+ | Er-147: 11/2^- | Er-148: 0^+ | Er-149: 1/2^+ | Er-150: 0^+ | Er-151: 7/2^- | Er-152: 0^+ | Er-153: 7/2^- | Er-154: 0^+ | Er-155: 7/2^- | Er-156: 0^+ | Er-157: 3/2^- | Er-158: 0^+ | Er-159: 3/2^- | Er-160: 0^+ | Er-161: 3/2^- | Er-162: 0^+ | Er-163: 5/2^- | Er-164: 0^+ | Er-165: 5/2^- | Er-166: 0^+ | Er-167: 7/2^+ | Er-168: 0^+ | Er-169: 1/2^- | Er-170: 0^+ | Er-171: 5/2^- | Er-172: 0^+ | Er-173: 7/2^- | Er-174: 0^+ | Er-175: 9/2^+ | Er-176: 0^+ | Er-177: 1/2^- | Ac-206: 3^+ | Ac-207: 9/2^- | Ac-208: 3^+ | Ac-209: 9/2^- | Ac-210: 7^+ | Ac-211: 9/2^- | Ac-212: 6^+ | Ac-213: 9/2^- | Ac-214: 5^+ | Ac-215: 9/2^- | Ac-216: 1^- | Ac-217: 9/2^- | Ac-218: 1^- | Ac-219: 9/2^- | Ac-220: 3^- | Ac-221: 3/2^- | Ac-222: 1^- | Ac-223: 5/2^- | Ac-224: 0^- | Ac-225: 3/2^- | Ac-226: 1^- | Ac-227: 3/2^- | Ac-228: 3^+ | Ac-229: 3/2^+ | Ac-230: 1^+ | Ac-231: 1/2^+ | Ac-232: 1^+ | Ac-233: 1/2^+ | Ac-235: 1/2^+ unstable isotopes | Er-169 (9.4 days) | Er-172 (49.3 h) | Er-160 (28.58 h) | Er-165 (10.4 h) | Er-171 (7.5167 h) | Er-161 (193 min) | Er-158 (137.3 min) | Er-163 (75 min) | Er-159 (37 min) | Er-156 (19.5 min) | Er-157 (18.65 min) | Er-155 (5.33 min) | Er-154 (224 s) | Er-174 (190 s) | Er-173 (84 s) | Er-175 (72 s) | Er-153 (37.1 s) | Er-151 (23.5 s) | Er-176 (20 s) | Er-150 (18.5 s) | Er-152 (10.3 s) | Er-148 (4.6 s) | Er-149 (4 s) | Er-177 (3 s) | Er-147 (2.5 s) | Er-146 (1.7 s) | Er-145 (900 ms) | Er-143 (200 ms) | Er-144 (200 ns) | Ac-227 (21.772 yr) | Ac-225 (10 days) | Ac-226 (29.36 h) | Ac-228 (6.14 h) | Ac-224 (170 min) | Ac-229 (62.67 min) | Ac-231 (7.5 min) | Ac-233 (145 s) | Ac-223 (126 s) | Ac-230 (122 s) | Ac-232 (119 s) | Ac-236 (100 s) | Ac-235 (60 s) | Ac-234 (44 s) | Ac-214 (8.2 s) | Ac-222 (5 s) | Ac-212 (930 ms) | Ac-213 (738 ms) | Ac-210 (350 ms) | Ac-211 (210 ms) | Ac-215 (170 ms) | Ac-209 (100 ms) | Ac-208 (95 ms) | Ac-221 (52 ms) | Ac-207 (27 ms) | Ac-220 (26.36 ms) | Ac-206 (22 ms) | Ac-216 (440 µs) | Ac-219 (11.8 µs) | Ac-218 (1.08 µs) | Ac-217 (69 ns) neutron cross-section | 165 b | 880 b neutron mass absorption | 0.036 m^2/kg | 0.079 m^2/kg

| erbium | actinium CAS number | 7440-52-0 | 7440-34-8 PubChem CID number | 23980 | 23965