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Exa-12.1(a)
The following method of representing atoms is followed throughout the chapter
x,ySz
where x=atomic number y=mass number z= Neutron Number S=symbol of the atom
The helium can be reperesented as 2,4He2
Exa-12.1(b)
The helium can be reperesented as 50,116Sn66
Exa-12.1(c)
The helium can be reperesented as 92,235U143
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