Input interpretation
radioactive elements | in alkali metals
Result
francium
Periodic table location
Periodic table location
Image
Image
Basic elemental properties
![atomic symbol | Fr atomic number | 87 short electronic configuration | [Rn]7s^1 Aufbau diagram | 7s block | s group | 1 period | 7 atomic mass | 223 u (unified atomic mass units) (atomic mass number given for longest-lived isotope) half-life | 22 minutes](../image_source/b3e8c4030ac88caee4a794fc5ccf8de4.png)
atomic symbol | Fr atomic number | 87 short electronic configuration | [Rn]7s^1 Aufbau diagram | 7s block | s group | 1 period | 7 atomic mass | 223 u (unified atomic mass units) (atomic mass number given for longest-lived isotope) half-life | 22 minutes
Thermodynamic properties
phase at STP | solid molar heat of fusion | 2 kJ/mol (rank: 81st) molar heat of vaporization | 65 kJ/mol (rank: 73rd) (properties at standard conditions)
Electromagnetic properties
color | (silver)
Reactivity
valence | 1 electronegativity | 0.7 first ionization energy | 380 kJ/mol (kilojoules per mole) ionization energies | 380 kJ/mol
Atomic properties
term symbol | ^2S_(1/2) covalent radius | 260 pm (electronic ground state properties)
(neutral francium atomic spectrum)
Abundances
human abundance | 0 mass% human molar abundance | 0 mol%
Nuclear properties
half-life | 22 min lifetime | 32 min (rank: 1st) specific radioactivity | 1.421×10^6 TBq/g decay mode | beta decay nuclear spin | Fr-199: 1/2^+ | Fr-200: 3^+ | Fr-201: 9/2^- | Fr-202: 3^+ | Fr-203: 9/2^- | Fr-204: 3^+ | Fr-205: 9/2^- | Fr-207: 9/2^- | Fr-208: 7^+ | Fr-209: 9/2^- | Fr-210: 6^+ | Fr-211: 9/2^- | Fr-212: 5^+ | Fr-213: 9/2^- | Fr-214: 1^- | Fr-215: 9/2^- | Fr-216: 1^- | Fr-217: 9/2^- | Fr-218: 1^- | Fr-219: 9/2^- | Fr-220: 1^+ | Fr-221: 5/2^- | Fr-222: 2^- | Fr-223: 3/2^- | Fr-224: 1^- | Fr-225: 3/2^- | Fr-226: 1^- | Fr-227: 1/2^+ | Fr-228: 2^- | Fr-229: 1/2^+ | Fr-231: 1/2^+ | Fr-232: 5^? unstable isotopes | Fr-223 (22 min) | Fr-212 (20 min) | Fr-222 (14.2 min) | Fr-221 (4.83 min) | Fr-225 (3.95 min) | Fr-224 (200 s) | Fr-210 (191 s) | Fr-211 (186 s) | Fr-227 (148 s) | Fr-208 (59.1 s) | Fr-229 (50.2 s) | Fr-209 (50 s) | Fr-226 (49 s) | Fr-228 (38 s) | Fr-213 (34.82 s) | Fr-220 (27.4 s) | Fr-230 (19.1 s) | Fr-231 (17.6 s) | Fr-206 (16 s) | Fr-207 (14.8 s) | Fr-232 (5.5 s) | Fr-205 (3.8 s) | Fr-204 (1.7 s) | Fr-203 (550 ms) | Fr-202 (300 ms) | Fr-201 (61 ms) | Fr-200 (49 ms) | Fr-219 (20 ms) | Fr-199 (12 ms) | Fr-214 (5 ms) | Fr-218 (1 ms) | Fr-217 (19 µs) | Fr-216 (700 ns) | Fr-215 (86 ns)
Identifiers
CAS number | 7440-73-5 PubChem CID number | 6328145