性 质HeNeArKrXeRn颜 色无色无色无色无色无色无色光谱颜色(放电管中)粉红红蓝紫蓝绿亮白色-气体密度(g/L)0.17850.90021.78093.7085.8519.73熔点(K)0.9524.584.0116.6161.2202.2沸点(K)4.2527.387.5120.3166.1208.2溶解度(mol/L,293K)13.814.737.973110.9-临界温度(K)5.2544.45153.15210.65289.75377.65气化热(kJ/mol)0.091.86.39.713.718.0*: 在2.6MPa下性 质HeNeArKrXeRn原子序数21018365486原子量4.0020.1839.9583.80131.3222.0价电子结构1s2s2p3s3p4s4p5s5p6s6p原子(范得华)半径(pm)122160191198--第Ⅰ电离势(kJ/mol)237220811521135111701037第Ⅱ电离势(kJ/mol)52503952266623502046-恒压热容Cp(J/K·mol)20.7920.7920.7920.7920.7920.79热容商Cp/Cν1.651.641.661.691.67-