protactinium vs actinium

protactinium (chemical element) | actinium (chemical element)

Periodic table location

Images

| protactinium | actinium atomic symbol | Pa | Ac atomic number | 91 | 89 short electronic configuration | [Rn]7s^25f^26d^1 | [Rn]7s^26d^1 Aufbau diagram | 6d 5f 7s | 6d 7s block | f | f period | 7 | 7 atomic mass | 231.03588 u | 227 u half-life | 32790 yr | 21.787 yr

| protactinium | actinium phase at STP | solid | solid melting point | 1572 °C | 1050 °C boiling point | 4000 °C | 3200 °C molar heat of fusion | 15 kJ/mol | 14 kJ/mol molar heat of vaporization | 470 kJ/mol | 400 kJ/mol specific heat at STP | 99.1 J/(kg K) | 120 J/(kg K) (properties at standard conditions)

| protactinium | actinium density | 15.37 g/cm^3 | 10.07 g/cm^3 molar volume | 15.032 cm^3/mol | 22.5 cm^3/mol thermal conductivity | 47 W/(m K) | 12 W/(m K) (properties at standard conditions)

| protactinium | actinium electrical type | conductor | resistivity | 1.8×10^-7 Ω m (ohm meters) | electrical conductivity | 5.6×10^6 S/m (siemens per meter) | magnetic type | paramagnetic | volume magnetic susceptibility | 4.995×10^-4 | mass magnetic susceptibility | 3.25×10^-8 m^3/kg (cubic meters per kilogram) | molar magnetic susceptibility | 7.509×10^-9 m^3/mol (cubic meters per mole) | superconducting point | 1.4 K (kelvins) | color | (silver) | (silver)

| protactinium | actinium valence | 5 | 3 electronegativity | 1.5 | 1.1 first ionization energy | 568 kJ/mol (kilojoules per mole) | 499 kJ/mol (kilojoules per mole) ionization energies | 568 kJ/mol | 499 kJ/mol | 1170 kJ/mol

Reactivity

| protactinium | actinium term symbol | ^4K_(11/2) | ^2D_(3/2) atomic radius | 180 pm | 195 pm covalent radius | 200 pm | 215 pm (electronic ground state properties)

| protactinium | actinium solar abundance | | 0 mass% crust abundance | 9.9×10^-13 mass% | ocean abundance | 2×10^-23 mass% | human abundance | 0 mass% | 0 mass% solar molar abundance | | 0 mol% ocean molar abundance | 5×10^-6 mol% | crust molar abundance | 9×10^-6 mol% | human molar abundance | 0 mol% | 0 mol%

| protactinium | actinium half-life | 32790 yr | 21.787 yr lifetime | 47280 yr | 31.431 yr specific radioactivity | 1.748 GBq/g | 2.676 TBq/g decay mode | alpha emission | beta decay nuclear spin | Pa-212: 7^+ | Pa-213: 9/2^- | Pa-215: 9/2^- | Pa-217: 9/2^- | Pa-219: 9/2^- | Pa-220: 1^- | Pa-221: 9/2^- | Pa-223: 9/2^- | Pa-224: 5^- | Pa-225: 5/2^- | Pa-227: 5/2^- | Pa-228: 3^+ | Pa-229: 5/2^+ | Pa-230: 2^- | Pa-231: 3/2^- | Pa-232: 2^- | Pa-233: 3/2^- | Pa-234: 4^+ | Pa-235: 3/2^- | Pa-236: 1^- | Pa-237: 1/2^+ | Pa-238: 3^- | Pa-239: 3/2^- | 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 | Pa-231 (32760 yr) | Pa-233 (26.975 days) | Pa-230 (17 days) | Pa-229 (36 h) | Pa-232 (31.7 h) | Pa-228 (22 h) | Pa-234 (6.7 h) | Pa-239 (110 min) | Pa-227 (38 min) | Pa-235 (24.43 min) | Pa-236 (9.17 min) | Pa-237 (8.67 min) | Pa-238 (136 s) | Pa-226 (110 s) | Pa-240 (100 s) | Pa-225 (1.7 s) | Pa-224 (850 ms) | Pa-216 (150 ms) | Pa-214 (17 ms) | Pa-215 (14 ms) | Pa-213 (5.3 ms) | Pa-223 (5.1 ms) | Pa-212 (5.1 ms) | Pa-217 (3.6 ms) | Pa-222 (3.3 ms) | Pa-218 (113 µs) | Pa-221 (5.9 µs) | Pa-220 (780 ns) | Pa-219 (53 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 | 200 b | 880 b neutron mass absorption | | 0.079 m^2/kg

| protactinium | actinium CAS number | 7440-13-3 | 7440-34-8 PubChem CID number | | 23965