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

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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`""_(79)^(35)Br` is not acceptable because mass number should be written as superscript and atomic number as subscribe. `""_(35)Br` is not acceptable because atomic number of an element is fixed but mass number is not fixed. It depends on the isotopes. thus, indication of mass number is essential.
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