Noble gases TRENDS

Atomic Mass- mass of an atom He 4.003amu Ne 20.18amu Ar 39.948amu Kr 83.798amu Xe 131.294amu Rn 222amu

Atomic size- radius of an atom He 31pm Ne 38pm Ar 71pm Kr 88pm Xe 108pm Rn 120pm

reactivity- ability of an element to undergo chemical changes Unreactive Ne Ar Kr Xe Rn

Shielding effect- full core shells blocking the positive nuclear force from reaching the valence shell He Ne 2 Ar 10 Kr 28 Xe 46 Rn 78

Ionization energy- energy required to remove an electron He 2372 Ne 2081 Ar 1521 Kr 1351 Xe 1170 Rn 1037

Electronegativity- tendency of an atom to attract electrons He -- Ne Ar Kr Xe Rn