Question

forming anions
which of the following is most likely to form an anion?
transition metals
group 1a alkali metals
group 7a halogens
group 8a nobel gases

Explanation:

Anions are negatively - charged ions formed when an atom gains electrons. Halogens in Group 7a have 7 valence electrons and need to gain 1 electron to achieve a stable octet configuration, making them highly likely to form anions. Transition metals usually form cations by losing electrons. Group 1a alkali metals also form cations by losing their single valence electron. Noble gases in Group 8a have a stable electron configuration and are very unreactive, rarely forming ions.

Answer:

Group 7a halogens