Page 181 - Radiation Safety
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Electrons
• Paull Exclusion Principle : The upper limit to the number of
possible electrons in each shell/ orbit
Ne =2n 2
Where n is principle quantum number of the shell, which may take
on values 1,2,3,4,5,6,7 for the corresponding shell of the atom
Maximum numbers of electrons, Ne
Orbit k L M N O P Q
n 1 2 3 4 5 6 7
Number 2 8 18 32 50 72 98
17
