Arsenic will form a -3 ion (As³⁻). Here's why:
* Group 5: Elements in group 5 have 5 valence electrons (electrons in the outermost shell).
* Stability: Atoms tend to gain or lose electrons to achieve a stable electron configuration, often resembling the nearest noble gas.
* Octet Rule: The octet rule states that atoms are most stable when they have 8 valence electrons.
* Arsenic's Behavior: To achieve a stable octet, Arsenic is most likely to gain 3 electrons, forming an ion with a -3 charge (As³⁻).
