what is the formula for the arsenic ion. A. As3-
B. As2-
C. As,
D. As3+
I say c.
As has valences of +3, -3, and +5. Choice c is not an ion.
As is +3 in compounds such as As2O3. I would go with D as the better choice between A and D but A can be corrrect in some circumstances.
To determine the correct formula for the arsenic ion, we need to identify the charge of arsenic in its ion form. Arsenic belongs to Group 15 of the periodic table, which generally forms ions with a charge of -3.
Now let's analyze the options:
A. As3- : This option indicates that the arsenic ion carries a charge of -3, which matches the expected charge for arsenic ions.
B. As2- : This option indicates a charge of -2 for the arsenic ion, which is inconsistent with its usual charge of -3.
C. As : This option does not indicate any charge, and it is important to note that ions are identified by their charges.
D. As3+ : This option suggests a charge of +3 for the arsenic ion, which is not commonly observed for arsenic ions.
Therefore, the correct answer is A. As3-. The arsenic ion has a charge of -3.