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as

it is actually "As"

the "A" has to be capitalized to be correct, or it could stand for something totally different.

In addition to the above, it might be helpful to see how the answer is derived:-

First deduct the number of neutrons from the mass number -

73 minus 40 equals 33

This gives the Atomic Number 33. Reading down the Periodic Table to find element number 33, we find that it is Arsenic, chemical symbol As.

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