 Xenon has atomic number 54 ; that is , its nucleus contains 54 protons . At standard temperature and pressure , pure xenon gas has a density of 5 @.@ 761 kg / m3 , about 4 @.@ 5 times the surface density of the Earth 's atmosphere , 1 @.@ 217 kg / m3 . As a liquid , xenon has a density of up to 3 @.@ 100 g / mL , with the density maximum occurring at the triple point . Notably , liquid xenon has a high polarizability due to its large atomic volume , and thus is an excellent solvent . It can dissolve hydrocarbons , biological molecules , and even water . Under the same conditions , the density of solid xenon , 3 @.@ 640 g / cm3 , is higher than the average density of granite , 2 @.@ 75 g / cm3 . Using gigapascals of pressure , xenon has been forced into a metallic phase . 
 Xenon <a href='got' title='1'><mark>has</mark></a> atomic number 54 ; that is , its nucleus <a href='uninflect' title='2'><mark>contains</mark></a> 54 protons . At standard temperature and pressure , pure xenon gas <a href='got' title='3'><mark>has</mark></a> a density of 5 @.@ 761 kg / m3 , about 4 @.@ 5 times the surface density of the Earth <a href='null_genetive' title='4'><mark>'s</mark></a>atmosphere , 1 @.@ 217 kg / m3 . As a liquid , xenon <a href='got' title='5'><mark>has</mark></a> a density of up to 3 @.@ 100 g / mL , with the density maximum occurring at the triple point . Notably , liquid xenon <a href='got' title='6'><mark>has</mark></a> a high polarizability due to its large atomic volume , and thus <a href='drop_aux' title='7'><mark>is</mark></a>an excellent solvent . It can dissolve hydrocarbons , biological molecules , and even water . Under the same conditions , the density of solid xenon , 3 @.@ 640 g / cm3 , <a href='drop_aux' title='8'><mark>is</mark></a>higher than the average density of granite , 2 @.@ 75 g / cm3 . Using gigapascals of pressure , xenon <a href='been_done' title='9'><mark>has</mark></a> been forced into a metallic phase . 
Xenon got atomic number 54 ; that is , its nucleus contain 54 protons . At standard temperature and pressure , pure xenon gas got a density of 5 @.@ 761 kg / m3 , about 4 @.@ 5 times da surface density of tdaEarth  atmosphere , 1 @.@ 217 kg / m3 . As a liquid , xenon got a density of up to 3 @.@ 100 g / mL , with the density maximum occurring at the triple point . Notably , liquid xenon got a high polarizability due to its bigass atomic volume , and thus an excellent solvent . It can dissolve hydrocarbons , biological molecules , and even water . Under thdaame conditions , the density of solid xenon , 3 @.@ 640 g / cm3 , higher den thedaerage density of granite , 2 @.@ 75 g / cm3 . usin gigapascals of pressure , xenon done been forced into a metallic phase .