helium vs barium vs strontium vs lithium

helium (chemical element) | barium (chemical element) | strontium (chemical element) | lithium (chemical element)

Periodic table location

Images

| atomic symbol | atomic number | short electronic configuration helium | He | 2 | 1s^2 barium | Ba | 56 | [Xe]6s^2 strontium | Sr | 38 | [Kr]5s^2 lithium | Li | 3 | [He]2s^1 | Aufbau diagram | block | group helium | 1s | s | 18 barium | 6s | s | 2 strontium | 5s | s | 2 lithium | 2s | s | 1 | period | atomic mass | half-life helium | 1 | 4.002602 u | (stable) barium | 6 | 137.327 u | (stable) strontium | 5 | 87.62 u | (stable) lithium | 2 | 6.94 u | (stable)

phase at STP | all | gas | solid melting point | median | 727 °C | highest | 777 °C (strontium) | lowest | 180.54 °C (lithium) boiling point | median | 1362 °C | highest | 1870 °C (barium) | lowest | -268.93 °C (helium) | distribution | molar heat of fusion | median | 5.5 kJ/mol | highest | 8 kJ/mol (barium) | lowest | 0.02 kJ/mol (helium) | distribution | molar heat of vaporization | median | 139 kJ/mol | highest | 147 kJ/mol (lithium) | lowest | 0.083 kJ/mol (helium) specific heat at STP | median | 1935 J/(kg K) | highest | 5193.1 J/(kg K) (helium) | lowest | 205 J/(kg K) (barium) | distribution | (properties at standard conditions)

density | median | 1.582 g/cm^3 | highest | 3.51 g/cm^3 (barium) | lowest | 1.785×10^-4 g/cm^3 (helium) | distribution | liquid density | median | 2.375 g/cm^3 | highest | 3.338 g/cm^3 (barium) | lowest | 0.512 g/cm^3 (lithium) | distribution | molar volume | median | 36.22 cm^3/mol | highest | 22420 cm^3/mol (helium) | lowest | 13 cm^3/mol (lithium) Mohs hardness | median | 1.25 | highest | 1.5 (between talc and gypsum) (strontium) | lowest | 0.6 (between talc and gypsum) (lithium) | distribution | shear modulus | median | 4.9 GPa | highest | 6.1 GPa (strontium) | lowest | 4.2 GPa (lithium) | distribution | Poisson ratio | all | 0.28 ultimate tensile strength | all | 15 MPa sound speed | median | 1620 m/s | highest | 6000 m/s (lithium) | lowest | 970 m/s (helium) thermal expansion | median | 2.25×10^-5 K^(-1) | highest | 4.6×10^-5 K^(-1) (lithium) | lowest | 2.06×10^-5 K^(-1) (barium) thermal conductivity | median | 26 W/(m K) | highest | 85 W/(m K) (lithium) | lowest | 0.1513 W/(m K) (helium) | distribution | (properties at standard conditions)

resistivity | median | 1.3×10^-7 Ω m (ohm meters) | highest | 3.5×10^-7 Ω m (ohm meters) (barium) | lowest | 9.4×10^-8 Ω m (ohm meters) (lithium) | distribution | electrical conductivity | median | 7.7×10^6 S/m (siemens per meter) | highest | 1.1×10^7 S/m (siemens per meter) (lithium) | lowest | 2.9×10^6 S/m (siemens per meter) (barium) | distribution | volume magnetic susceptibility | median | 8.58×10^-6 | highest | 3.966×10^-5 (barium) | lowest | -1.05×10^-9 (helium) | distribution | mass magnetic susceptibility | median | 6.31×10^-9 m^3/kg (cubic meters per kilogram) | highest | 2.56×10^-8 m^3/kg (cubic meters per kilogram) (lithium) | lowest | -5.9×10^-9 m^3/kg (cubic meters per kilogram) (helium) | distribution | molar magnetic susceptibility | median | 1.47×10^-10 m^3/mol (cubic meters per mole) | highest | 1.552×10^-9 m^3/mol (cubic meters per mole) (barium) | lowest | -2.36×10^-11 m^3/mol (cubic meters per mole) (helium) | distribution | work function | all | 2.52 eV | 2.59 eV | 2.93 eV

valence | median | 1.5 | highest | 2 (barium and strontium) | lowest | 0 (helium) | distribution | electronegativity | median | 0.95 | highest | 0.98 (lithium) | lowest | 0.89 (barium) | distribution | electron affinity | median | 9.49 kJ/mol (kilojoules per mole) | highest | 59.6 kJ/mol (kilojoules per mole) (lithium) | lowest | 0 kJ/mol (kilojoules per mole) (helium) first ionization energy | median | 534.9 kJ/mol (kilojoules per mole) | highest | 2372.3 kJ/mol (kilojoules per mole) (helium) | lowest | 502.9 kJ/mol (kilojoules per mole) (barium)

term symbol | all | ^1S_0 | ^2S_(1/2) atomic radius | median | 173 pm | highest | 215 pm (barium) | lowest | 31 pm (helium) | distribution | covalent radius | median | 162 pm | highest | 215 pm (barium) | lowest | 28 pm (helium) | distribution | (electronic ground state properties)

universe abundance | median | 2.5×10^-6 mass% | highest | 23 mass% (helium) | lowest | 6×10^-7 mass% (lithium) solar abundance | median | 3×10^-6 mass% | highest | 23 mass% (helium) | lowest | 6×10^-9 mass% (lithium) meteorite abundance | median | 2.7×10^-4 mass% | highest | 8.7×10^-4 mass% (strontium) | lowest | 1.7×10^-4 mass% (lithium) | distribution | crust abundance | median | 0.018 mass% | highest | 0.036 mass% (strontium) | lowest | 5.5×10^-7 mass% (helium) ocean abundance | median | 1.1×10^-5 mass% | highest | 8.1×10^-4 mass% (strontium) | lowest | 7.2×10^-10 mass% (helium) human abundance | median | 3×10^-5 mass% | highest | 4.6×10^-4 mass% (strontium) | lowest | 3×10^-6 mass% (lithium) universe molar abundance | median | 8×10^-8 mol% | highest | 7.2 mol% (helium) | lowest | 9×10^-9 mol% (barium) solar molar abundance | median | 4×10^-8 mol% | highest | 7.4 mol% (helium) | lowest | 9.9×10^-10 mol% (lithium) meteorite molar abundance | median | 2×10^-4 mol% | highest | 4.6×10^-4 mol% (lithium) | lowest | 4.1×10^-5 mol% (barium) | distribution | ocean molar abundance | median | 8.1×10^-6 mol% | highest | 5.7×10^-5 mol% (strontium) | lowest | 1.1×10^-9 mol% (helium) crust molar abundance | median | 0.005 mol% | highest | 0.0085 mol% (strontium) | lowest | 3×10^-6 mol% (helium) | distribution | human molar abundance | median | 2.7×10^-6 mol% | highest | 3.3×10^-5 mol% (strontium) | lowest | 1.4×10^-6 mol% (barium)