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Symbols ""(35)^(79)Br and ""^(79)Br can ...

Symbols `""_(35)^(79)Br and ""^(79)Br` can be written, whereas symbols `""_(79)^(35)Br and ""^(35)Br` are not acceptable. Answer briefly.

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Atomic number of an element is fixed. However, mass number is not fixed as it depends upon the isotope taken. Hence, it is essential to indicate mass number.
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