4 The Atom & Electronic Configuration

Bohr Model of the Atom ,[object Object],[object Object],[object Object],[object Object]

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[object Object],2p x x Helium contains 2 electrons and 2 protons. When 1 electron is removed there are still 2 positive charges in the nucleus  more attraction on the remaining electron which then requires more energy to remove.

[object Object],[object Object],[object Object],[object Object],[object Object],The outer electron is easier to remove as it is in a shell further away from the nucleus x 3p x x

[object Object],[object Object],x x x The 4 electrons in the second shell are easier to remove than the 2 in the first shell as they are further from the nucleus. x 6p x x

[object Object],6 The first 2 electrons are relatively easy to remove, the 2 nd two slightly harder and the last 2 much harder. The first 4 are in the outer shell the last 2 are in the inner shell Notice the ease of removal is not a smooth trend from 1 -4 . There is a slight jump in ionisation energy between the 2nd and 3rd electron. This suggests that the 1& 2 electrons being removed are in a slightly lower energy level than the 3 & 4

[object Object],6p x x x x x x 1s 2s 2p We now write the electronic configuration as 1s 2 2s 2 2p 2

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object]

4 The Atom & Electronic Configuration

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4 The Atom & Electronic Configuration