electronic structure

• how many electrons are allowed in each shell?

  1st shell=2

  everyone other shell=8
• atomic number tells you how many electrons are in the structure, give an example?

  magnesium has an atomic number of 12 so the electron configuration is 2, 8, 2
• what does the period number tell you about an electron configuration?


  how many shells it has
• what does the group number tell you about an electron configuration?

  how many electrons are in its outer shell
• if the an electron structure has a full outer shell, what property does this give?


  element will be very unreactive(group 0)