Wednesday, 13 February 2013

1.14 deduce the electronic configurations of the first 20 elements from their positions in the Periodic Table

Groups are colmns in the periodic table; the group number represents the number of electrons on the outer shell.

Periods are rows on the periodic table; the row corresponds with number of shell.

So if you have an element on the third row down in group seven: it will have three shell and 7 electrons on its outer shell.


  1. I am not sure about this but i think that the answer here is that group 1 has one electron in its outer shell, group 2 has 2 etc and period 1 has one shell, period 2 has 2 shells etc. so group 1 period 2 will have 2 shells and on its outer shell there will be one electron

    1. Oh yeah, I'm not sure what I was thinking ;P

  2. thanks sm save my life with sciences

  3. Hi, just to let you know that you misspelt columns