<Table> <Tr> <Th> Property </Th> <Th> Helium </Th> <Th> Neon </Th> <Th> Argon </Th> <Th> Krypton </Th> <Th> Xenon </Th> <Th> Radon </Th> </Tr> <Tr> <Td> Density ( g / dm ) </Td> <Td> 0.1786 </Td> <Td> 0.9002 </Td> <Td> 1.7818 </Td> <Td> 3.708 </Td> <Td> 5.851 </Td> <Td> 9.97 </Td> </Tr> <Tr> <Td> Boiling point ( K ) </Td> <Td> 4.4 </Td> <Td> 27.3 </Td> <Td> 87.4 </Td> <Td> 121.5 </Td> <Td> 166.6 </Td> <Td> 211.5 </Td> </Tr> <Tr> <Td> Melting point ( K ) </Td> <Td> 0.95 ( at 25 bar ) </Td> <Td> 24.7 </Td> <Td> 83.6 </Td> <Td> 115.8 </Td> <Td> 161.7 </Td> <Td> 202.2 </Td> </Tr> <Tr> <Td> Enthalpy of vaporization ( kJ / mol ) </Td> <Td> 0.08 </Td> <Td> 1.74 </Td> <Td> 6.52 </Td> <Td> 9.05 </Td> <Td> 12.65 </Td> <Td> 18.1 </Td> </Tr> <Tr> <Td> Solubility in water at 20 ° C ( cm / kg ) </Td> <Td> 8.61 </Td> <Td> 10.5 </Td> <Td> 33.6 </Td> <Td> 59.4 </Td> <Td> 108.1 </Td> <Td> 230 </Td> </Tr> <Tr> <Td> Atomic number </Td> <Td> </Td> <Td> 10 </Td> <Td> 18 </Td> <Td> 36 </Td> <Td> 54 </Td> <Td> 86 </Td> </Tr> <Tr> <Td> Atomic radius ( calculated ) ( pm ) </Td> <Td> 31 </Td> <Td> 38 </Td> <Td> 71 </Td> <Td> 88 </Td> <Td> 108 </Td> <Td> 120 </Td> </Tr> <Tr> <Td> Ionization energy ( kJ / mol ) </Td> <Td> 2372 </Td> <Td> 2080 </Td> <Td> 1520 </Td> <Td> 1351 </Td> <Td> 1170 </Td> <Td> 1037 </Td> </Tr> <Tr> <Td> Allen electronegativity </Td> <Td> 4.16 </Td> <Td> 4.79 </Td> <Td> 3.24 </Td> <Td> 2.97 </Td> <Td> 2.58 </Td> <Td> 2.60 </Td> </Tr> </Table>
<Table> <Tr> <Th> Property </Th> <Th> Helium </Th> <Th> Neon </Th> <Th> Argon </Th> <Th> Krypton </Th> <Th> Xenon </Th> <Th> Radon </Th> </Tr> <Tr> <Td> Density ( g / dm ) </Td> <Td> 0.1786 </Td> <Td> 0.9002 </Td> <Td> 1.7818 </Td> <Td> 3.708 </Td> <Td> 5.851 </Td> <Td> 9.97 </Td> </Tr> <Tr> <Td> Boiling point ( K ) </Td> <Td> 4.4 </Td> <Td> 27.3 </Td> <Td> 87.4 </Td> <Td> 121.5 </Td> <Td> 166.6 </Td> <Td> 211.5 </Td> </Tr> <Tr> <Td> Melting point ( K ) </Td> <Td> 0.95 ( at 25 bar ) </Td> <Td> 24.7 </Td> <Td> 83.6 </Td> <Td> 115.8 </Td> <Td> 161.7 </Td> <Td> 202.2 </Td> </Tr> <Tr> <Td> Enthalpy of vaporization ( kJ / mol ) </Td> <Td> 0.08 </Td> <Td> 1.74 </Td> <Td> 6.52 </Td> <Td> 9.05 </Td> <Td> 12.65 </Td> <Td> 18.1 </Td> </Tr> <Tr> <Td> Solubility in water at 20 ° C ( cm / kg ) </Td> <Td> 8.61 </Td> <Td> 10.5 </Td> <Td> 33.6 </Td> <Td> 59.4 </Td> <Td> 108.1 </Td> <Td> 230 </Td> </Tr> <Tr> <Td> Atomic number </Td> <Td> </Td> <Td> 10 </Td> <Td> 18 </Td> <Td> 36 </Td> <Td> 54 </Td> <Td> 86 </Td> </Tr> <Tr> <Td> Atomic radius ( calculated ) ( pm ) </Td> <Td> 31 </Td> <Td> 38 </Td> <Td> 71 </Td> <Td> 88 </Td> <Td> 108 </Td> <Td> 120 </Td> </Tr> <Tr> <Td> Ionization energy ( kJ / mol ) </Td> <Td> 2372 </Td> <Td> 2080 </Td> <Td> 1520 </Td> <Td> 1351 </Td> <Td> 1170 </Td> <Td> 1037 </Td> </Tr> <Tr> <Td> Allen electronegativity </Td> <Td> 4.16 </Td> <Td> 4.79 </Td> <Td> 3.24 </Td> <Td> 2.97 </Td> <Td> 2.58 </Td> <Td> 2.60 </Td> </Tr> </Table>
the boiling points of the elements helium neon argon krypton
the boiling points of the elements helium neon argon krypton
4.4 27.3 87.4 121.5
4.4 27.3 87.4 121.5