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helium vs barium vs strontium

Input interpretation

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

Periodic table location

Periodic table location
Periodic table location

Images

Images
Images

Basic elemental properties

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

Thermodynamic properties

| helium | barium | strontium phase at STP | gas | solid | solid melting point | | 727 °C | 777 °C boiling point | -268.93 °C | 1870 °C | 1382 °C critical temperature | 5.19 K | (unknown) | critical pressure | 0.227 MPa | (unknown) | molar heat of fusion | 0.02 kJ/mol | 8 kJ/mol | 8 kJ/mol molar heat of vaporization | 0.083 kJ/mol | 140 kJ/mol | 137 kJ/mol specific heat at STP | 5193.1 J/(kg K) | 205 J/(kg K) | 300 J/(kg K) adiabatic index | 5/3 | | (properties at standard conditions)
| helium | barium | strontium phase at STP | gas | solid | solid melting point | | 727 °C | 777 °C boiling point | -268.93 °C | 1870 °C | 1382 °C critical temperature | 5.19 K | (unknown) | critical pressure | 0.227 MPa | (unknown) | molar heat of fusion | 0.02 kJ/mol | 8 kJ/mol | 8 kJ/mol molar heat of vaporization | 0.083 kJ/mol | 140 kJ/mol | 137 kJ/mol specific heat at STP | 5193.1 J/(kg K) | 205 J/(kg K) | 300 J/(kg K) adiabatic index | 5/3 | | (properties at standard conditions)

Material properties

| helium | barium | strontium density | 1.785×10^-4 g/cm^3 | 3.51 g/cm^3 | 2.63 g/cm^3 liquid density | | 3.338 g/cm^3 | 2.375 g/cm^3 molar volume | 22420 cm^3/mol | 39.12 cm^3/mol | 33.32 cm^3/mol Mohs hardness | | 1.25 (between talc and gypsum) | 1.5 (between talc and gypsum) bulk modulus | | 9.6 GPa | shear modulus | | 4.9 GPa | 6.1 GPa Young's modulus | | 13 GPa | Poisson ratio | | | 0.28 refractive index | 1.000035 | (unknown) | sound speed | 970 m/s | 1620 m/s | thermal expansion | | 2.06×10^-5 K^(-1) | 2.25×10^-5 K^(-1) thermal conductivity | 0.1513 W/(m K) | 18 W/(m K) | 35 W/(m K) (properties at standard conditions)
| helium | barium | strontium density | 1.785×10^-4 g/cm^3 | 3.51 g/cm^3 | 2.63 g/cm^3 liquid density | | 3.338 g/cm^3 | 2.375 g/cm^3 molar volume | 22420 cm^3/mol | 39.12 cm^3/mol | 33.32 cm^3/mol Mohs hardness | | 1.25 (between talc and gypsum) | 1.5 (between talc and gypsum) bulk modulus | | 9.6 GPa | shear modulus | | 4.9 GPa | 6.1 GPa Young's modulus | | 13 GPa | Poisson ratio | | | 0.28 refractive index | 1.000035 | (unknown) | sound speed | 970 m/s | 1620 m/s | thermal expansion | | 2.06×10^-5 K^(-1) | 2.25×10^-5 K^(-1) thermal conductivity | 0.1513 W/(m K) | 18 W/(m K) | 35 W/(m K) (properties at standard conditions)

Electromagnetic properties

| helium | barium | strontium electrical type | | conductor | conductor resistivity | | 3.5×10^-7 Ω m (ohm meters) | 1.3×10^-7 Ω m (ohm meters) electrical conductivity | | 2.9×10^6 S/m (siemens per meter) | 7.7×10^6 S/m (siemens per meter) magnetic type | diamagnetic | paramagnetic | paramagnetic volume magnetic susceptibility | -1.05×10^-9 | 3.966×10^-5 | 3.47×10^-6 mass magnetic susceptibility | -5.9×10^-9 m^3/kg (cubic meters per kilogram) | 1.13×10^-8 m^3/kg (cubic meters per kilogram) | 1.32×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | -2.36×10^-11 m^3/mol (cubic meters per mole) | 1.552×10^-9 m^3/mol (cubic meters per mole) | 1.16×10^-10 m^3/mol (cubic meters per mole) work function | | 2.52 eV (Polycrystalline) | 2.59 eV (Polycrystalline) threshold frequency | | 6.093×10^14 Hz (hertz) | 6.263×10^14 Hz (hertz) color | (colorless) | (silver) | (silver) refractive index | 1.000035 | (unknown) |
| helium | barium | strontium electrical type | | conductor | conductor resistivity | | 3.5×10^-7 Ω m (ohm meters) | 1.3×10^-7 Ω m (ohm meters) electrical conductivity | | 2.9×10^6 S/m (siemens per meter) | 7.7×10^6 S/m (siemens per meter) magnetic type | diamagnetic | paramagnetic | paramagnetic volume magnetic susceptibility | -1.05×10^-9 | 3.966×10^-5 | 3.47×10^-6 mass magnetic susceptibility | -5.9×10^-9 m^3/kg (cubic meters per kilogram) | 1.13×10^-8 m^3/kg (cubic meters per kilogram) | 1.32×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | -2.36×10^-11 m^3/mol (cubic meters per mole) | 1.552×10^-9 m^3/mol (cubic meters per mole) | 1.16×10^-10 m^3/mol (cubic meters per mole) work function | | 2.52 eV (Polycrystalline) | 2.59 eV (Polycrystalline) threshold frequency | | 6.093×10^14 Hz (hertz) | 6.263×10^14 Hz (hertz) color | (colorless) | (silver) | (silver) refractive index | 1.000035 | (unknown) |

Reactivity

| helium | barium | strontium valence | 0 | 2 | 2 electronegativity | | 0.89 | 0.95 electron affinity | 0 kJ/mol (kilojoules per mole) | 13.95 kJ/mol (kilojoules per mole) | 5.03 kJ/mol (kilojoules per mole) first ionization energy | 2372.3 kJ/mol (kilojoules per mole) | 502.9 kJ/mol (kilojoules per mole) | 549.5 kJ/mol (kilojoules per mole) ionization energies | 2372.3 kJ/mol | 5250.5 kJ/mol | 502.9 kJ/mol | 965.2 kJ/mol | 3600 kJ/mol | 549.5 kJ/mol | 1064.2 kJ/mol | 4138 kJ/mol | 5500 kJ/mol | 6910 kJ/mol | 8760 kJ/mol | 10230 kJ/mol | 11800 kJ/mol | 15600 kJ/mol | 17100 kJ/mol
| helium | barium | strontium valence | 0 | 2 | 2 electronegativity | | 0.89 | 0.95 electron affinity | 0 kJ/mol (kilojoules per mole) | 13.95 kJ/mol (kilojoules per mole) | 5.03 kJ/mol (kilojoules per mole) first ionization energy | 2372.3 kJ/mol (kilojoules per mole) | 502.9 kJ/mol (kilojoules per mole) | 549.5 kJ/mol (kilojoules per mole) ionization energies | 2372.3 kJ/mol | 5250.5 kJ/mol | 502.9 kJ/mol | 965.2 kJ/mol | 3600 kJ/mol | 549.5 kJ/mol | 1064.2 kJ/mol | 4138 kJ/mol | 5500 kJ/mol | 6910 kJ/mol | 8760 kJ/mol | 10230 kJ/mol | 11800 kJ/mol | 15600 kJ/mol | 17100 kJ/mol
Reactivity
Reactivity

Atomic properties

| helium | barium | strontium term symbol | ^1S_0 | ^1S_0 | ^1S_0 atomic radius | 31 pm | 215 pm | 200 pm covalent radius | 28 pm | 215 pm | 195 pm van der Waals radius | 140 pm | (unknown) | (electronic ground state properties)
| helium | barium | strontium term symbol | ^1S_0 | ^1S_0 | ^1S_0 atomic radius | 31 pm | 215 pm | 200 pm covalent radius | 28 pm | 215 pm | 195 pm van der Waals radius | 140 pm | (unknown) | (electronic ground state properties)

Abundances

| helium | barium | strontium universe abundance | 23 mass% | 1×10^-6 mass% | 4×10^-6 mass% solar abundance | 23 mass% | 1×10^-6 mass% | 5×10^-6 mass% meteorite abundance | | 2.7×10^-4 mass% | 8.7×10^-4 mass% crust abundance | 5.5×10^-7 mass% | 0.034 mass% | 0.036 mass% ocean abundance | 7.2×10^-10 mass% | 3×10^-6 mass% | 8.1×10^-4 mass% human abundance | | 3×10^-5 mass% | 4.6×10^-4 mass% universe molar abundance | 7.2 mol% | 9×10^-9 mol% | 6×10^-8 mol% solar molar abundance | 7.4 mol% | 9.9×10^-9 mol% | 7×10^-8 mol% meteorite molar abundance | | 4.1×10^-5 mol% | 2×10^-4 mol% ocean molar abundance | 1.1×10^-9 mol% | 1.4×10^-7 mol% | 5.7×10^-5 mol% crust molar abundance | 3×10^-6 mol% | 0.0051 mol% | 0.0085 mol% human molar abundance | | 1.4×10^-6 mol% | 3.3×10^-5 mol%
| helium | barium | strontium universe abundance | 23 mass% | 1×10^-6 mass% | 4×10^-6 mass% solar abundance | 23 mass% | 1×10^-6 mass% | 5×10^-6 mass% meteorite abundance | | 2.7×10^-4 mass% | 8.7×10^-4 mass% crust abundance | 5.5×10^-7 mass% | 0.034 mass% | 0.036 mass% ocean abundance | 7.2×10^-10 mass% | 3×10^-6 mass% | 8.1×10^-4 mass% human abundance | | 3×10^-5 mass% | 4.6×10^-4 mass% universe molar abundance | 7.2 mol% | 9×10^-9 mol% | 6×10^-8 mol% solar molar abundance | 7.4 mol% | 9.9×10^-9 mol% | 7×10^-8 mol% meteorite molar abundance | | 4.1×10^-5 mol% | 2×10^-4 mol% ocean molar abundance | 1.1×10^-9 mol% | 1.4×10^-7 mol% | 5.7×10^-5 mol% crust molar abundance | 3×10^-6 mol% | 0.0051 mol% | 0.0085 mol% human molar abundance | | 1.4×10^-6 mol% | 3.3×10^-5 mol%

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