I think the correct answer from the choices listed above is option D. Members of the alkali metals easily lose an electron to form a +1 cation. The halogens represents element like F, Cl which easily gain an electron. Alkaline earth metals represents element like Mg, Ca which easily lose two electrons.
The correct answer to the question is alkali metals.
Halogens are group 17 elements. They have 7 valence electrons. They are non metals and they form ion by accepting electron. Hence, they form anion.
Alkaline earth metals are the group 2 elements. They have 2 valence electrons. They form cation by losing their 2 valence electrons.
Noble gas are the group 18 elements. They have completely filled outermost shell. They do not form ion.
Alkali metals are the group 1 elements. They have 1 valence electron. They form cation by losing their 1 valence electron.
Considering the options given in the question above, the correct answer to the question is alkali metals.
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