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. y u always get it wrong every time i go into the comments someone is correcting you

  2. thanks sm save my life with sciences

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

  4. The Chemistry Syllabus has changed…

    Here is a New blog for the 2017 Syllabus: