Question

the elements in groups ia, iia, and viia are called ____________, respectively.
alkali metals, alkaline earth metals, halogens
alkaline earth metals, chalcogens, halogens
alkali metals, alkaline earth metals, pnictogens
alkali metals, chalcogens, halogens
alkali metals, pnictogens, chalcogens

Explanation:

Group IA elements are known as alkali metals (e.g., lithium, sodium). Group IIA elements are alkaline - earth metals (e.g., beryllium, magnesium). Group VIIA elements are halogens (e.g., fluorine, chlorine). Chalcogens are Group VIA elements, pnictogens are Group VA elements. So we check each option:

• Option 1: alkali metals (IA), alkaline earth metals (IIA), halogens (VIIA) - correct.
• Option 2: alkaline earth metals (IIA) is correct for IIA, but chalcogens (VIA) are wrong for VIIA.
• Option 3: pnictogens (VA) are wrong for VIIA.
• Option 4: chalcogens (VIA) are wrong for IIA.
• Option 5: pnictogens (VA) and chalcogens (VIA) are wrong for IIA and VIIA respectively.

Answer:

alkali metals, alkaline earth metals, halogens