potassium, O

potassium (chemical element) | oxygen (chemical element)

Periodic table location

Images

| potassium | oxygen atomic symbol | K | O atomic number | 19 | 8 short electronic configuration | [Ar]4s^1 | [He]2s^22p^4 Aufbau diagram | 4s | 2p 2s block | s | p group | 1 | 16 period | 4 | 2 atomic mass | 39.0983 u | 15.999 u half-life | (stable) | (stable)

| potassium | oxygen phase at STP | solid | gas melting point | 63.38 °C | -218.3 °C boiling point | 759 °C | -182.9 °C critical temperature | 2223 K | 154.59 K critical pressure | 16 MPa | 5.043 MPa molar heat of fusion | 2.33 kJ/mol | 0.222 kJ/mol molar heat of vaporization | 76.9 kJ/mol | 3.41 kJ/mol specific heat at STP | 757 J/(kg K) | 919 J/(kg K) adiabatic index | | 7/5 (properties at standard conditions)

| potassium | oxygen density | 0.856 g/cm^3 | 0.001429 g/cm^3 liquid density | 0.828 g/cm^3 | molar volume | 45.7 cm^3/mol | 11200 cm^3/mol Mohs hardness | 0.4 (between talc and gypsum) | Brinell hardness | 0.363 MPa | bulk modulus | 3.1 GPa | shear modulus | 1.3 GPa | refractive index | | 1.000271 sound speed | 2000 m/s | 317.5 m/s thermal conductivity | 100 W/(m K) | 0.02658 W/(m K) (properties at standard conditions)

| potassium | oxygen electrical type | conductor | resistivity | 7×10^-8 Ω m (ohm meters) | electrical conductivity | 1.4×10^7 S/m (siemens per meter) | magnetic type | paramagnetic | paramagnetic volume magnetic susceptibility | 5.74×10^-6 | 1.90772×10^-6 mass magnetic susceptibility | 6.7×10^-9 m^3/kg (cubic meters per kilogram) | 1.335×10^-6 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 2.62×10^-10 m^3/mol (cubic meters per mole) | 4.27184×10^-8 m^3/mol (cubic meters per mole) work function | 2.29 eV (Polycrystalline) | threshold frequency | 5.537×10^14 Hz (hertz) | color | (silver) | (colorless) refractive index | | 1.000271

| potassium | oxygen valence | 1 | 2 electronegativity | 0.82 | 3.44 electron affinity | 48.4 kJ/mol (kilojoules per mole) | 141 kJ/mol (kilojoules per mole) first ionization energy | 418.8 kJ/mol (kilojoules per mole) | 1313.9 kJ/mol (kilojoules per mole) ionization energies | 418.8 kJ/mol | 3052 kJ/mol | 4420 kJ/mol | 5877 kJ/mol | 7975 kJ/mol | 9590 kJ/mol | 11343 kJ/mol | 14944 kJ/mol | 16963.7 kJ/mol | 48610 kJ/mol | 1313.9 kJ/mol | 3388.3 kJ/mol | 5300.5 kJ/mol | 7469.2 kJ/mol | 10989.5 kJ/mol | 13326.5 kJ/mol | 71330 kJ/mol | 84078 kJ/mol

Reactivity

| potassium | oxygen term symbol | ^2S_(1/2) | ^3P_2 atomic radius | 220 pm | 60 pm covalent radius | 203 pm | 66 pm van der Waals radius | 275 pm | 152 pm (electronic ground state properties)

| potassium | oxygen universe abundance | 3×10^-4 mass% | 1 mass% solar abundance | 4×10^-4 mass% | 0.9 mass% meteorite abundance | 0.07 mass% | 40 mass% crust abundance | 1.5 mass% | 46 mass% ocean abundance | 0.042 mass% | 86 mass% human abundance | 0.2 mass% | 61 mass% universe molar abundance | 1×10^-5 mol% | 0.08 mol% solar molar abundance | 9.9×10^-6 mol% | 0.07 mol% meteorite molar abundance | 0.037 mol% | 48 mol% ocean molar abundance | 0.0066 mol% | 33 mol% crust molar abundance | 0.78 mol% | 60 mol% human molar abundance | 0.032 mol% | 24 mol%

| potassium | oxygen half-life | (stable) | (stable) stable isotopes | K-39 (93.2581%) | K-41 (6.7302%) | O-16 (99.762%) | O-18 (0.2%) | O-17 (3.8×10^-4) nuclear spin | K-32: 1^+ | K-33: 3/2^+ | K-34: 1^+ | K-35: 3/2^+ | K-36: 2^+ | K-37: 3/2^+ | K-38: 3^+ | K-39: 3/2^+ | K-40: 4^- | K-41: 3/2^+ | K-42: 2^- | K-43: 3/2^+ | K-44: 2^- | K-45: 3/2^+ | K-46: 2^- | K-47: 1/2^+ | K-48: 2^- | K-49: 3/2^+ | K-52: 2^- | K-53: 3/2^+ | K-54: 2^- | K-55: 3/2^+ | O-12: 0^+ | O-13: 3/2^- | O-14: 0^+ | O-15: 1/2^- | O-16: 0^+ | O-17: 5/2^+ | O-18: 0^+ | O-19: 5/2^+ | O-20: 0^+ | O-21: 5/2^+ | O-22: 0^+ | O-23: 1/2^+ | O-24: 0^+ | O-25: 3/2^+ | O-26: 0^+ | O-27: 3/2^+ | O-28: 0^+ unstable isotopes | K-40 (1.248 Gyr) | K-43 (22.3 h) | K-42 (12.321 h) | K-44 (22.13 min) | K-45 (17.81 min) | K-38 (7.637 min) | K-46 (105 s) | K-47 (17.5 s) | K-48 (6.8 s) | K-49 (1.26 s) | K-37 (1.226 s) | K-50 (472 ms) | K-51 (365 ms) | K-36 (342 ms) | K-35 (178 ms) | K-52 (105 ms) | K-53 (30 ms) | K-54 (10 ms) | K-55 (3 ms) | K-34 (25 ns) | K-33 (25 ns) | O-15 (122.24 s) | O-14 (70.606 s) | O-19 (26.88 s) | O-20 (13.51 s) | O-21 (3.42 s) | O-22 (2.25 s) | O-23 (82 ms) | O-24 (65 ms) | O-13 (8.58 ms) | O-27 (260 ns) | O-28 (100 ns) | O-25 (50 ns) | O-26 (40 ns) | O-12 (1.14 zs) neutron cross-section | 2.1 b | 2.8×10^-4 b neutron mass absorption | 0.0018 m^2/kg | 1×10^-6 m^2/kg

| potassium | oxygen CAS number | 7440-09-7 | 7782-44-7 PubChem CID number | 5462222 | 977