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Proton
Relative charge : +1
Relative Mass : 1
Neutron
Relative charge : 0
Relative Mass : 1
Electron
Relative charge : -1
Relative Mass : 1/1840 = 0
How to find how many e- held in a shell?
Use equation :
2n² → n = no. of shells
e.g no of e- in shell 2 = 2(2²) = 8
Evolution of atomic structure