Period Two TRENDS.

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Presentation transcript:

Period Two TRENDS

Atomic Mass- mass of an atom Li 6.941amu Be 9.012amu B 10.811amu C 12.00amu N 14.00amu O 16.00amu F 18.99amu Ne 20.18amu

Atomic size- radius of an atom Li 167pm Be 112pm B 87pm C 67pm N 56pm O 48pm F 42pm Ne 38pm

reactivity- ability of an element to undergo chemical changes Reacts with water Be Does not react with water B Does not react with oxygen C N Not very reactive O Reacts slowly with metal F Explodes upon contact with metals Ne Unreactive

Shielding effect- full core shells blocking the positive nuclear force from reaching the valence shell Li 2 Be B C N O F Ne

Ionization energy- energy required to remove an electron Li 520 Be 900 B 800 C 1090 N 1400 O 1310 F 1680 Ne 2080

Electronegativity- tendency of an atom to attract electrons Li 1 Be 1.5 B 2.0 C 2.5 N 3.0 O 3.5 F 4.0 Ne --