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potassium vs hydrogen

Input interpretation

potassium (chemical element) | hydrogen (chemical element)
potassium (chemical element) | hydrogen (chemical element)

Periodic table location

Periodic table location
Periodic table location

Images

Images
Images

Basic elemental properties

| potassium | hydrogen atomic symbol | K | H atomic number | 19 | 1 short electronic configuration | [Ar]4s^1 | 1s^1 Aufbau diagram | 4s | 1s block | s | s group | 1 | 1 period | 4 | 1 atomic mass | 39.0983 u | 1.008 u half-life | (stable) | (stable)
| potassium | hydrogen atomic symbol | K | H atomic number | 19 | 1 short electronic configuration | [Ar]4s^1 | 1s^1 Aufbau diagram | 4s | 1s block | s | s group | 1 | 1 period | 4 | 1 atomic mass | 39.0983 u | 1.008 u half-life | (stable) | (stable)

Thermodynamic properties

| potassium | hydrogen phase at STP | solid | gas melting point | 63.38 °C | -259.14 °C boiling point | 759 °C | -252.87 °C critical temperature | 2223 K | 32.97 K critical pressure | 16 MPa | 1.293 MPa molar heat of fusion | 2.33 kJ/mol | 0.558 kJ/mol molar heat of vaporization | 76.9 kJ/mol | 0.452 kJ/mol specific heat at STP | 757 J/(kg K) | 14300 J/(kg K) adiabatic index | | 7/5 (properties at standard conditions)
| potassium | hydrogen phase at STP | solid | gas melting point | 63.38 °C | -259.14 °C boiling point | 759 °C | -252.87 °C critical temperature | 2223 K | 32.97 K critical pressure | 16 MPa | 1.293 MPa molar heat of fusion | 2.33 kJ/mol | 0.558 kJ/mol molar heat of vaporization | 76.9 kJ/mol | 0.452 kJ/mol specific heat at STP | 757 J/(kg K) | 14300 J/(kg K) adiabatic index | | 7/5 (properties at standard conditions)

Material properties

| potassium | hydrogen density | 0.856 g/cm^3 | 8.99×10^-5 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 | | 1.000132 sound speed | 2000 m/s | 1270 m/s thermal conductivity | 100 W/(m K) | 0.1805 W/(m K) (properties at standard conditions)
| potassium | hydrogen density | 0.856 g/cm^3 | 8.99×10^-5 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 | | 1.000132 sound speed | 2000 m/s | 1270 m/s thermal conductivity | 100 W/(m K) | 0.1805 W/(m K) (properties at standard conditions)

Electromagnetic properties

| potassium | hydrogen 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 | diamagnetic volume magnetic susceptibility | 5.74×10^-6 | -2.23×10^-9 mass magnetic susceptibility | 6.7×10^-9 m^3/kg (cubic meters per kilogram) | -2.48×10^-8 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 2.62×10^-10 m^3/mol (cubic meters per mole) | -4.999×10^-11 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 | | 1.000132
| potassium | hydrogen 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 | diamagnetic volume magnetic susceptibility | 5.74×10^-6 | -2.23×10^-9 mass magnetic susceptibility | 6.7×10^-9 m^3/kg (cubic meters per kilogram) | -2.48×10^-8 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 2.62×10^-10 m^3/mol (cubic meters per mole) | -4.999×10^-11 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 | | 1.000132

Reactivity

| potassium | hydrogen valence | 1 | 1 electronegativity | 0.82 | 2.2 electron affinity | 48.4 kJ/mol (kilojoules per mole) | 72.8 kJ/mol (kilojoules per mole) first ionization energy | 418.8 kJ/mol (kilojoules per mole) | 1312 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 | 1312 kJ/mol
| potassium | hydrogen valence | 1 | 1 electronegativity | 0.82 | 2.2 electron affinity | 48.4 kJ/mol (kilojoules per mole) | 72.8 kJ/mol (kilojoules per mole) first ionization energy | 418.8 kJ/mol (kilojoules per mole) | 1312 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 | 1312 kJ/mol
Reactivity
Reactivity

Atomic properties

| potassium | hydrogen term symbol | ^2S_(1/2) | ^2S_(1/2) atomic radius | 220 pm | 25 pm covalent radius | 203 pm | 31 pm van der Waals radius | 275 pm | 120 pm (electronic ground state properties)
| potassium | hydrogen term symbol | ^2S_(1/2) | ^2S_(1/2) atomic radius | 220 pm | 25 pm covalent radius | 203 pm | 31 pm van der Waals radius | 275 pm | 120 pm (electronic ground state properties)

Abundances

| potassium | hydrogen universe abundance | 3×10^-4 mass% | 75 mass% solar abundance | 4×10^-4 mass% | 75 mass% meteorite abundance | 0.07 mass% | 2.4 mass% crust abundance | 1.5 mass% | 0.15 mass% ocean abundance | 0.042 mass% | 11 mass% human abundance | 0.2 mass% | 10 mass% universe molar abundance | 1×10^-5 mol% | 93 mol% solar molar abundance | 9.9×10^-6 mol% | 93 mol% meteorite molar abundance | 0.037 mol% | 17 mol% ocean molar abundance | 0.0066 mol% | 66 mol% crust molar abundance | 0.78 mol% | 3.1 mol% human molar abundance | 0.032 mol% | 62 mol%
| potassium | hydrogen universe abundance | 3×10^-4 mass% | 75 mass% solar abundance | 4×10^-4 mass% | 75 mass% meteorite abundance | 0.07 mass% | 2.4 mass% crust abundance | 1.5 mass% | 0.15 mass% ocean abundance | 0.042 mass% | 11 mass% human abundance | 0.2 mass% | 10 mass% universe molar abundance | 1×10^-5 mol% | 93 mol% solar molar abundance | 9.9×10^-6 mol% | 93 mol% meteorite molar abundance | 0.037 mol% | 17 mol% ocean molar abundance | 0.0066 mol% | 66 mol% crust molar abundance | 0.78 mol% | 3.1 mol% human molar abundance | 0.032 mol% | 62 mol%

Nuclear properties

| potassium | hydrogen half-life | (stable) | (stable) stable isotopes | K-39 (93.2581%) | K-41 (6.7302%) | H-1 (99.985%) | H-2 (1.5×10^-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^+ | H-1: 1/2^+ | H-2: 1^+ | H-3: 1/2^+ | H-4: 2^- | H-5: 1/2^+ | H-6: 2^- | H-7: 1/2^+ 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) | H-3 (12.32 yr) | H-6 (0.29 zs) | H-4 (0.139 zs) | H-5 (0.08 zs) | H-7 (0.023 zs) neutron cross-section | 2.1 b | 0.332 b neutron mass absorption | 0.0018 m^2/kg | 0.011 m^2/kg
| potassium | hydrogen half-life | (stable) | (stable) stable isotopes | K-39 (93.2581%) | K-41 (6.7302%) | H-1 (99.985%) | H-2 (1.5×10^-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^+ | H-1: 1/2^+ | H-2: 1^+ | H-3: 1/2^+ | H-4: 2^- | H-5: 1/2^+ | H-6: 2^- | H-7: 1/2^+ 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) | H-3 (12.32 yr) | H-6 (0.29 zs) | H-4 (0.139 zs) | H-5 (0.08 zs) | H-7 (0.023 zs) neutron cross-section | 2.1 b | 0.332 b neutron mass absorption | 0.0018 m^2/kg | 0.011 m^2/kg

Identifiers

| potassium | hydrogen CAS number | 7440-09-7 | 1333-74-0 PubChem CID number | 5462222 | 783
| potassium | hydrogen CAS number | 7440-09-7 | 1333-74-0 PubChem CID number | 5462222 | 783

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