calcium vs potassium vs iridium vs platinum

calcium (chemical element) | potassium (chemical element) | iridium (chemical element) | platinum (chemical element)

Periodic table location

Images

| atomic symbol | atomic number | short electronic configuration calcium | Ca | 20 | [Ar]4s^2 potassium | K | 19 | [Ar]4s^1 iridium | Ir | 77 | [Xe]6s^24f^145d^7 platinum | Pt | 78 | [Xe]6s^14f^145d^9 | Aufbau diagram | block | group calcium | 4s | s | 2 potassium | 4s | s | 1 iridium | 5d 4f 6s | d | 9 platinum | 5d 4f 6s | d | 10 | period | atomic mass | half-life calcium | 4 | 40.078 u | (stable) potassium | 4 | 39.0983 u | (stable) iridium | 6 | 192.217 u | (stable) platinum | 6 | 195.084 u | (stable)

phase at STP | all | solid melting point | median | 1305 °C | highest | 2466 °C (iridium) | lowest | 63.38 °C (potassium) | distribution | boiling point | median | 2654 °C | highest | 4428 °C (iridium) | lowest | 759 °C (potassium) | distribution | molar heat of fusion | median | 14 kJ/mol | highest | 26 kJ/mol (iridium) | lowest | 2.33 kJ/mol (potassium) molar heat of vaporization | median | 322 kJ/mol | highest | 560 kJ/mol (iridium) | lowest | 76.9 kJ/mol (potassium) specific heat at STP | median | 382 J/(kg K) | highest | 757 J/(kg K) (potassium) | lowest | 131 J/(kg K) (iridium) (properties at standard conditions)

density | median | 11.5 g/cm^3 | highest | 22.56 g/cm^3 (iridium) | lowest | 0.856 g/cm^3 (potassium) liquid density | median | 10.189 g/cm^3 | highest | 19.77 g/cm^3 (platinum) | lowest | 0.828 g/cm^3 (potassium) molar volume | median | 17.48 cm^3/mol | highest | 45.7 cm^3/mol (potassium) | lowest | 8.52 cm^3/mol (iridium) | distribution | Mohs hardness | median | 2.6 | highest | 6.5 (between microcline and quartz) (iridium) | lowest | 0.4 (between talc and gypsum) (potassium) | distribution | Vickers hardness | all | 549 MPa | 1760 MPa Brinell hardness | all | 0.363 MPa | 167 MPa | 392 MPa | 1670 MPa bulk modulus | median | 124 GPa | highest | 320 GPa (iridium) | lowest | 3.1 GPa (potassium) | distribution | shear modulus | median | 34 GPa | highest | 210 GPa (iridium) | lowest | 1.3 GPa (potassium) | distribution | Young's modulus | median | 168 GPa | highest | 528 GPa (iridium) | lowest | 20 GPa (calcium) Poisson ratio | all | 0.26 | 0.31 | 0.38 sound speed | median | 3245 m/s | highest | 4825 m/s (iridium) | lowest | 2000 m/s (potassium) | distribution | thermal expansion | median | 8.8×10^-6 K^(-1) | highest | 2.23×10^-5 K^(-1) (calcium) | lowest | 6.4×10^-6 K^(-1) (iridium) thermal conductivity | median | 125 W/(m K) | highest | 200 W/(m K) (calcium) | lowest | 72 W/(m K) (platinum) | distribution | (properties at standard conditions)

resistivity | median | 5.8×10^-8 Ω m (ohm meters) | highest | 1.1×10^-7 Ω m (ohm meters) (platinum) | lowest | 3.4×10^-8 Ω m (ohm meters) (calcium) | distribution | electrical conductivity | median | 1.8×10^7 S/m (siemens per meter) | highest | 2.9×10^7 S/m (siemens per meter) (calcium) | lowest | 9.4×10^6 S/m (siemens per meter) (platinum) | distribution | volume magnetic susceptibility | median | 2.95×10^-5 | highest | 2.573×10^-4 (platinum) | lowest | 5.74×10^-6 (potassium) mass magnetic susceptibility | median | 9.45×10^-9 m^3/kg (cubic meters per kilogram) | highest | 1.38×10^-8 m^3/kg (cubic meters per kilogram) (calcium) | lowest | 1.67×10^-9 m^3/kg (cubic meters per kilogram) (iridium) | distribution | molar magnetic susceptibility | median | 4.37×10^-10 m^3/mol (cubic meters per mole) | highest | 2.38×10^-9 m^3/mol (cubic meters per mole) (platinum) | lowest | 2.62×10^-10 m^3/mol (cubic meters per mole) (potassium) | distribution | work function | all | 2.29 eV | 2.87 eV | (5 to 5.76) eV | (5.12 to 5.93) eV

valence | median | 4 | highest | 6 (iridium and platinum) | lowest | 1 (potassium) | distribution | electronegativity | median | 1.6 | highest | 2.28 (platinum) | lowest | 0.82 (potassium) | distribution | electron affinity | median | 99.7 kJ/mol (kilojoules per mole) | highest | 205.3 kJ/mol (kilojoules per mole) (platinum) | lowest | 2.37 kJ/mol (kilojoules per mole) (calcium) | distribution | first ionization energy | median | 730 kJ/mol (kilojoules per mole) | highest | 880 kJ/mol (kilojoules per mole) (iridium) | lowest | 418.8 kJ/mol (kilojoules per mole) (potassium)

term symbol | all | ^1S_0 | ^2S_(1/2) | ^3D_3 | ^4F_(9/2) atomic radius | median | 158 pm | highest | 220 pm (potassium) | lowest | 135 pm (iridium and platinum) | distribution | covalent radius | median | 158 pm | highest | 203 pm (potassium) | lowest | 136 pm (platinum) | distribution | (electronic ground state properties)

universe abundance | median | 1.5×10^-4 mass% | highest | 0.007 mass% (calcium) | lowest | 2×10^-7 mass% (iridium) solar abundance | median | 2×10^-4 mass% | highest | 0.007 mass% (calcium) | lowest | 2×10^-7 mass% (iridium) meteorite abundance | median | 0.035 mass% | highest | 1.1 mass% (calcium) | lowest | 5.4×10^-5 mass% (iridium) crust abundance | median | 0.75 mass% | highest | 5 mass% (calcium) | lowest | 4×10^-8 mass% (iridium) universe molar abundance | median | 5×10^-6 mol% | highest | 2×10^-4 mol% (calcium) | lowest | 1×10^-9 mol% (iridium) solar molar abundance | median | 5×10^-6 mol% | highest | 2×10^-4 mol% (calcium) | lowest | 9.9×10^-10 mol% (iridium) meteorite molar abundance | median | 0.019 mol% | highest | 0.52 mol% (calcium) | lowest | 6×10^-6 mol% (iridium) crust molar abundance | median | 0.39 mol% | highest | 2.6 mol% (calcium) | lowest | 5×10^-9 mol% (iridium)