Thursday, October 16, 2014

3.1.3 Apply the relationship in between the electron arrangement of elements and their position in the Periodic Table up to Z = 20.

The position of an element is related to the electron arrangement in the atom.

  • The period number represents how many shells it has. 
  • The group number represents how many valence electron(s) the atom contains.
example) Sodium
  • period 3 - sodium has 3 occupied energy levels, (shells).
  • group 1 - one electron in the outer shell. 
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1 comment:

  1. Richard C. LambertOctober 29, 2015 at 12:52 AM

    To implement the "One" part of the Department-Contacts relationship, decorate the Contact class Department property with the Association attribute. web

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