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helium vs krypton vs argon

Input interpretation

helium (chemical element) | krypton (chemical element) | argon (chemical element)
helium (chemical element) | krypton (chemical element) | argon (chemical element)

Periodic table location

Periodic table location
Periodic table location

Images

Images
Images

Basic elemental properties

| helium | krypton | argon atomic symbol | He | Kr | Ar atomic number | 2 | 36 | 18 short electronic configuration | 1s^2 | [Ar]4s^23d^104p^6 | [Ne]3s^23p^6 Aufbau diagram | 1s | 4p 3d 4s | 3p 3s block | s | p | p group | 18 | 18 | 18 period | 1 | 4 | 3 atomic mass | 4.002602 u | 83.798 u | 39.948 u half-life | (stable) | (stable) | (stable)
| helium | krypton | argon atomic symbol | He | Kr | Ar atomic number | 2 | 36 | 18 short electronic configuration | 1s^2 | [Ar]4s^23d^104p^6 | [Ne]3s^23p^6 Aufbau diagram | 1s | 4p 3d 4s | 3p 3s block | s | p | p group | 18 | 18 | 18 period | 1 | 4 | 3 atomic mass | 4.002602 u | 83.798 u | 39.948 u half-life | (stable) | (stable) | (stable)

Thermodynamic properties

| helium | krypton | argon phase at STP | gas | gas | gas melting point | | -157.36 °C | -189.3 °C boiling point | -268.93 °C | -153.22 °C | -185.8 °C critical temperature | 5.19 K | 209.41 K | 150.87 K critical pressure | 0.227 MPa | 5.5 MPa | 4.898 MPa molar heat of fusion | 0.02 kJ/mol | 1.64 kJ/mol | 1.18 kJ/mol molar heat of vaporization | 0.083 kJ/mol | 9.02 kJ/mol | 6.5 kJ/mol specific heat at STP | 5193.1 J/(kg K) | 248.05 J/(kg K) | 520.33 J/(kg K) adiabatic index | 5/3 | 5/3 | 5/3 (properties at standard conditions)
| helium | krypton | argon phase at STP | gas | gas | gas melting point | | -157.36 °C | -189.3 °C boiling point | -268.93 °C | -153.22 °C | -185.8 °C critical temperature | 5.19 K | 209.41 K | 150.87 K critical pressure | 0.227 MPa | 5.5 MPa | 4.898 MPa molar heat of fusion | 0.02 kJ/mol | 1.64 kJ/mol | 1.18 kJ/mol molar heat of vaporization | 0.083 kJ/mol | 9.02 kJ/mol | 6.5 kJ/mol specific heat at STP | 5193.1 J/(kg K) | 248.05 J/(kg K) | 520.33 J/(kg K) adiabatic index | 5/3 | 5/3 | 5/3 (properties at standard conditions)

Material properties

| helium | krypton | argon density | 1.785×10^-4 g/cm^3 | 0.00375 g/cm^3 | 0.001784 g/cm^3 molar volume | 22420 cm^3/mol | 22300 cm^3/mol | 22390 cm^3/mol refractive index | 1.000035 | 1.000427 | 1.000281 sound speed | 970 m/s | 1120 m/s | 319 m/s thermal conductivity | 0.1513 W/(m K) | 0.00943 W/(m K) | 0.01772 W/(m K) (properties at standard conditions)
| helium | krypton | argon density | 1.785×10^-4 g/cm^3 | 0.00375 g/cm^3 | 0.001784 g/cm^3 molar volume | 22420 cm^3/mol | 22300 cm^3/mol | 22390 cm^3/mol refractive index | 1.000035 | 1.000427 | 1.000281 sound speed | 970 m/s | 1120 m/s | 319 m/s thermal conductivity | 0.1513 W/(m K) | 0.00943 W/(m K) | 0.01772 W/(m K) (properties at standard conditions)

Electromagnetic properties

| helium | krypton | argon magnetic type | diamagnetic | diamagnetic | diamagnetic volume magnetic susceptibility | -1.05×10^-9 | -1.65×10^-8 | -1.07×10^-8 mass magnetic susceptibility | -5.9×10^-9 m^3/kg (cubic meters per kilogram) | -4.4×10^-9 m^3/kg (cubic meters per kilogram) | -6×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | -2.36×10^-11 m^3/mol (cubic meters per mole) | -3.69×10^-10 m^3/mol (cubic meters per mole) | -2.4×10^-10 m^3/mol (cubic meters per mole) color | (colorless) | (colorless) | (colorless) refractive index | 1.000035 | 1.000427 | 1.000281
| helium | krypton | argon magnetic type | diamagnetic | diamagnetic | diamagnetic volume magnetic susceptibility | -1.05×10^-9 | -1.65×10^-8 | -1.07×10^-8 mass magnetic susceptibility | -5.9×10^-9 m^3/kg (cubic meters per kilogram) | -4.4×10^-9 m^3/kg (cubic meters per kilogram) | -6×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | -2.36×10^-11 m^3/mol (cubic meters per mole) | -3.69×10^-10 m^3/mol (cubic meters per mole) | -2.4×10^-10 m^3/mol (cubic meters per mole) color | (colorless) | (colorless) | (colorless) refractive index | 1.000035 | 1.000427 | 1.000281

Reactivity

| helium | krypton | argon valence | 0 | 2 | 0 electronegativity | | 3 | electron affinity | 0 kJ/mol (kilojoules per mole) | 0 kJ/mol (kilojoules per mole) | 0 kJ/mol (kilojoules per mole) first ionization energy | 2372.3 kJ/mol (kilojoules per mole) | 1350.8 kJ/mol (kilojoules per mole) | 1520.6 kJ/mol (kilojoules per mole) ionization energies | 2372.3 kJ/mol | 5250.5 kJ/mol | 1350.8 kJ/mol | 2350.4 kJ/mol | 3565 kJ/mol | 5070 kJ/mol | 6240 kJ/mol | 7570 kJ/mol | 10710 kJ/mol | 12138 kJ/mol | 22274 kJ/mol | 25880 kJ/mol | 29700 kJ/mol | 33800 kJ/mol | 37700 kJ/mol | 43100 kJ/mol | 47500 kJ/mol | 52200 kJ/mol | 57100 kJ/mol | 61800 kJ/mol | 75800 kJ/mol | 80400 kJ/mol | 85300 kJ/mol | 1520.6 kJ/mol | 2665.8 kJ/mol | 3931 kJ/mol | 5771 kJ/mol | 7238 kJ/mol | 8781 kJ/mol | 11995 kJ/mol | 13842 kJ/mol | 40760 kJ/mol | 46186 kJ/mol
| helium | krypton | argon valence | 0 | 2 | 0 electronegativity | | 3 | electron affinity | 0 kJ/mol (kilojoules per mole) | 0 kJ/mol (kilojoules per mole) | 0 kJ/mol (kilojoules per mole) first ionization energy | 2372.3 kJ/mol (kilojoules per mole) | 1350.8 kJ/mol (kilojoules per mole) | 1520.6 kJ/mol (kilojoules per mole) ionization energies | 2372.3 kJ/mol | 5250.5 kJ/mol | 1350.8 kJ/mol | 2350.4 kJ/mol | 3565 kJ/mol | 5070 kJ/mol | 6240 kJ/mol | 7570 kJ/mol | 10710 kJ/mol | 12138 kJ/mol | 22274 kJ/mol | 25880 kJ/mol | 29700 kJ/mol | 33800 kJ/mol | 37700 kJ/mol | 43100 kJ/mol | 47500 kJ/mol | 52200 kJ/mol | 57100 kJ/mol | 61800 kJ/mol | 75800 kJ/mol | 80400 kJ/mol | 85300 kJ/mol | 1520.6 kJ/mol | 2665.8 kJ/mol | 3931 kJ/mol | 5771 kJ/mol | 7238 kJ/mol | 8781 kJ/mol | 11995 kJ/mol | 13842 kJ/mol | 40760 kJ/mol | 46186 kJ/mol
Reactivity
Reactivity

Atomic properties

| helium | krypton | argon term symbol | ^1S_0 | ^1S_0 | ^1S_0 atomic radius | 31 pm | 88 pm | 71 pm covalent radius | 28 pm | 116 pm | 106 pm van der Waals radius | 140 pm | 202 pm | 188 pm (electronic ground state properties)
| helium | krypton | argon term symbol | ^1S_0 | ^1S_0 | ^1S_0 atomic radius | 31 pm | 88 pm | 71 pm covalent radius | 28 pm | 116 pm | 106 pm van der Waals radius | 140 pm | 202 pm | 188 pm (electronic ground state properties)

Abundances

| helium | krypton | argon universe abundance | 23 mass% | 4×10^-6 mass% | 0.02 mass% solar abundance | 23 mass% | | 0.007 mass% crust abundance | 5.5×10^-7 mass% | 1.5×10^-8 mass% | 1.5×10^-4 mass% ocean abundance | 7.2×10^-10 mass% | 2.1×10^-8 mass% | 4.5×10^-5 mass% universe molar abundance | 7.2 mol% | 6×10^-8 mol% | 6×10^-4 mol% solar molar abundance | 7.4 mol% | | 2×10^-4 mol% ocean molar abundance | 1.1×10^-9 mol% | 1.6×10^-9 mol% | 7×10^-6 mol% crust molar abundance | 3×10^-6 mol% | 4×10^-9 mol% | 7.8×10^-5 mol%
| helium | krypton | argon universe abundance | 23 mass% | 4×10^-6 mass% | 0.02 mass% solar abundance | 23 mass% | | 0.007 mass% crust abundance | 5.5×10^-7 mass% | 1.5×10^-8 mass% | 1.5×10^-4 mass% ocean abundance | 7.2×10^-10 mass% | 2.1×10^-8 mass% | 4.5×10^-5 mass% universe molar abundance | 7.2 mol% | 6×10^-8 mol% | 6×10^-4 mol% solar molar abundance | 7.4 mol% | | 2×10^-4 mol% ocean molar abundance | 1.1×10^-9 mol% | 1.6×10^-9 mol% | 7×10^-6 mol% crust molar abundance | 3×10^-6 mol% | 4×10^-9 mol% | 7.8×10^-5 mol%

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