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3.2.1.1
what does Z represent
proton number
what does A represent
nucleon number
what is the charge for protons
+ 1.6× 10-19
what is the charge for neutrons
0
what is the charge for electrons
-1.6 × 10-19
what is the mass for protons
1.67 × 10-27
what is the mass for neutron
1.67 × 10-27
what is the mass for electrons
9.11 × 10-31
what is the equation for specific charge
charge / mass
what are isotope s
atoms with the same number of protons but different numbers of neutrons
Note 
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