Monday, January 28, 2013

Periodic Properties

                Elements tends to gain or lose valence electrons to achieve stable octet formation. ( Inert gases or noble gases of group VII of the periodic table ).


  • Electron added one at a time moving left to right across a periods. As this happens the electrons of the outermost shell experience increases strong nuclear attraction, so electron becomes closer to the nucleus and more tightly bound to it.
  • Moving down a column in the periodic table the outer most electrons become less tightly bounds to the nucleus. This happens because the number of fitted principle energy level increases downward within each group.
  • These trends explain the periodicity observed in the elemental properties of atomic radius, ionization energy, electron affinity and electronegativity.

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