Question

which of these elements is a transition metal?
barium magnesium
mercury arsenic

Explanation:

To determine the transition metal, we analyze each element:

• Barium (Ba) is an alkaline earth metal (group 2).
• Magnesium (Mg) is also an alkaline earth metal (group 2).
• Arsenic (As) is a metalloid (group 15).
• Mercury (Hg) is a transition metal (group 12, d - block).

Answer:

mercury