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Bohr models of atoms A, B, C, D are given (Symbols are not real). a) Write the atomic number, mass number and

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Bohr models of atoms A, B, C, D are given (Symbols are not real).

a) Write the atomic number, mass number and electronic configuration of the atoms. 

b) Among these, which are isotopes? Why?

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 Element  Atomic Number  Mass Number  Electron Configuration
 A  6  12  2,4
 B  7  15  2,8,5
 C  6  14  2,4
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