Which of the following d-block elements is a liquid at room temperature?

Which of the following d-block elements is a liquid at room temperature?

Step 1: Understand what d-block elements are. They are transition metals found in the middle of the periodic table.
Step 2: Know that most metals are solid at room temperature.
Step 3: Identify the d-block elements that are metals. Examples include iron (Fe), copper (Cu), and mercury (Hg).
Step 4: Check the physical state of these metals at room temperature (around 20-25 degrees Celsius).
Step 5: Realize that mercury (Hg) is unique because it is the only metal that is liquid at room temperature.
Step 6: Conclude that the answer to the question is mercury (Hg).

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