You divide this volume into small boxes that contain n electrons.
2.
We distribute the N electrons among the M boxes in all possible ways.
3.
In general, calculating the " n " th ionization energy requires calculating the energies of Z-n + 1 and Z-n electron systems.
4.
Consider a hydrogen atom which is simply made of a n electron and a proton; but there are distance between these two . why these electron and proton do not simply touch each other to form an atom ? The preceding talk ) 09 : 09, 15 May 2007 ( UTC ).
5.
So hydrogen contributes two particles ( a proton and an electron ) per nuclei ( which has a molecular mass equal to one ) : 2 / 1 = 2 \,, helium contributes three particles ( a nucleus and two electrons ) per nuclei ( which has a molecular mass equal to 4 ) : 3 / 4 = 0.75 \,, and metals contribute ( n + 1 ) particles ( a nucleus and n electrons ) per nuclei ( which has a molecular mass equal to 2n ) : ( n + 1 ) / 2n \ approx 0.5 \, . talk ) 15 : 17, 31 March 2011 ( UTC)
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