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Group Charg Example
e on
ion
forme
d
1 +1 Li+, Na+,
K+,Cs+
2 +2 Be2+,
Mg2+,
Ca2+
6 -2 O2-, s2-
7 -1 F-, Cl-, Br-
Positiv Charg Negativ Charg
e ions e e ions e
NH4+ +1 OH- -1
Zn2+ +2 NO3- -1
Al3+ +3 SO42- -2
Pb2+…

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Sub-Shell No. of
electrons
S 2e-
P 6e-
D 10e-
F 14e-
Particle Relative mass Relative
charge
Proton 1 +1
Neutron 1 0
Electron 1/1840 -1

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