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Alkali metals TRENDS
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Atomic Mass- mass of an atom
Li 6.941amu Na 22.99amu K 39.098amu Rb 85.468amu Cs amu Fr 223amu
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Atomic size- radius of an atom
Li 167pm Na 190pm K 243pm Rb 265pm Cs 298pm Fr n/a
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reactivity- ability of an element to undergo chemical changes
Reacts with water Na Reacts vigorously with water K Reacts violently with water Rb Explodes upon contact with water Cs Fr --
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Shielding effect- full core shells blocking the positive nuclear force from reaching the valence shell Li 2 Na 10 K 18 Rb 36 Cs 54 Fr 86
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Ionization energy- energy required to remove an electron
Li 520 Na 496 K 419 Rb 403 Cs 376 Fr 380
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Electronegativity- tendency of an atom to attract electrons
Li 1 Na 0.9 K 0.8 Rb Cs 0.7 Fr
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