Which elements are commonly associated with body-centered cubic metals?

Which elements are commonly associated with body-centered cubic metals?

• A. Copper, zinc, tin.
• B. Gold, silver, platinum.
• C. Iron, chromium, vanadium, molybdenum, tungsten.
• D. Aluminum, magnesium, silicon.

Answer: (C)

Body-centered cubic metals share a crystal arrangement where each unit cell has atoms at the eight corners and one in the center, giving eight nearest neighbors and a packing efficiency around 68%. Iron is the classic example at room temperature (alpha-Fe), and other transition metals such as chromium, vanadium, molybdenum, and tungsten also crystallize in the BCC arrangement. The other metals listed belong to different structures: copper is face-centered cubic, zinc is hexagonal close-packed, tin is tetragonal at room temperature, aluminum is FCC, magnesium is HCP, and silicon forms a covalent network. Thus, the group that includes iron and these transition metals is the one commonly associated with BCC metals.

Body-centered cubic metals share a crystal arrangement where each unit cell has atoms at the eight corners and one in the center, giving eight nearest neighbors and a packing efficiency around 68%. Iron is the classic example at room temperature (alpha-Fe), and other transition metals such as chromium, vanadium, molybdenum, and tungsten also crystallize in the BCC arrangement. The other metals listed belong to different structures: copper is face-centered cubic, zinc is hexagonal close-packed, tin is tetragonal at room temperature, aluminum is FCC, magnesium is HCP, and silicon forms a covalent network. Thus, the group that includes iron and these transition metals is the one commonly associated with BCC metals.