Answer
$_{35}^{33}Br$ can't be correct.
Work Step by Step
The mass number (top left number) for the element is calculated by:
Mass number = Number of protons + Number of neutrons.
Since all numbers must be positive, the mass number must be greater than or equal to the number of protons.
** Number of protons = Z (Bottom left number)
For $_{35}^{33}Br$ :
$33 = 35$ + Number of neutrons.
Number of neutrons = 33 - 35 = -2
It doesn't make sense to have "-2" neutrons in a nucleus.
