Symbols $_{35}^{79} B r$ and $^{79} B r$ can be written, whereas symbols $_{79}^{35} B r$ and $^{35} B r$ are not acceptable. Answer briefly:

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Solution

For a given element, the number of protons is the same for the isotopes, whereas the mass number can be different for the given atomic number.
Hence, the mass number should be written necessarily.

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Similar questions

Symbols $_{35}^{79} Br$ and $^{79} Br$ can be written, whereas symbols $_{79}^{35} Br$ and $^{35} Br$ are not acceptable. Answer briefly.

Symbols can be written, whereas symbols are not acceptable. Answer briefly.

B r

_{35}^{79} B r

_{35}^{81} B r

(50.3 %)

_{7}^{35} C l

_{6}^{12} C

_{35}^{81} B r

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