We know that the periodic table is organized into three main categories: metals, nonmetals, and metalloids. Identify which element below is incorrectly classified as a metal, nonmetal, or metalloid.
a. antimony (Sb) - metalloid
b. strontium (Sr) - metal
c. cerium (Ce) - metal
d. selenium (Se) - metalloid
e. rhodium (Rh) - metal
f. krypton (Kr) - nonmetal
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