Answer:
The correct answer is: it has 33 protons.
Step-by-step explanation:
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The atomic number of the Arsenic is 33.
This means that it has 33 electrons and 33 protons.
In this case it is the As + 3 ion, so it is indicated that it has 3 fewer electrons. But the number of protons always remains intact.
The final answer is: it has 33 protons.