Question

which of the following is correct?
argon is a halogen
magnesium is in period 2 group 3
calcium is an alkali metal
silver is a transition metal

Explanation:

• Argon: Halogens are in group 17 (e.g., F, Cl, Br). Argon (\(Ar\)) is in group 18 (noble gases).
• Magnesium: Period 3, group 2 (not period 2 group 3).
• Calcium: Alkaline - earth metals (group 2), not alkali metals (group 1).
• Silver (\(Ag\)): Located in the d - block of the periodic table, which classifies it as a transition metal.

Answer:

Silver is a transition metal.