Question

members of which group easily lose an electron to form a +1 cation?○ halogens○ alkaline earth metals○ noble gases○ alkali metals

Explanation:

Halogens have 7 valence electrons and tend to gain 1 electron to form -1 anions. Alkaline earth metals have 2 valence electrons and form +2 cations. Noble gases have full valence shells and are unreactive. Alkali metals have 1 valence electron, which they easily lose to achieve a stable noble gas electron configuration, forming +1 cations.

Answer:

alkali metals