Using the periodic table

Orbital Diagrams and the periodic table The modern periodic table is based off of orbital diagrams. You can quickly look at the placement of an atom on the periodic table to determine what its orbital diagram will look like.

Using the periodic table for electron configuration The period relates to the energy level of electrons Therefore H and He only have electrons in the 1 st energy level Li, Be, B, C,N,O,F and Ne have electrons up to the 2 nd energy level

You can determine the orbital by the placement Li H He For these elements the last electron is in the s orbital for these elements the last electron is in the p orbital For these elements the last electron is in the d orbital For the elements the last electron is in the f orbital

Determining the number of electrons in the last energy level count the number of elements to the left edge of the “section” For example Al It is the first element in the 2 nd row of p filling elements The last electron for aluminum will be the first electron possible in the 2 nd p

Continuing… Al The last electron will be the first possible in the 2 nd p 1 s __ 2 s __ p __ __ __ 3 s __ p __ __ __ d __ __ __ __ __

Condensed electron configuration long electron configurations are not normally written out because it gets rather repetitive Instead it is condensed, by starting from the previous Noble gas and adding shells to it. For example K [Ar]4s 1 This is the same as saying everything that is in Ar (1s 2 2s 2 p 6 3s 2 p 6 ) +4s 1

Class work For the following elements fill in the last shell only of the orbital diagram Ti, Cl, Sr, Sn, and O