Mercury (Hg) differs from other metals primarily because it is the only metal that is liquid at standard conditions for temperature and pressure. Therefore, the correct statement is:
- It is not solid under normal conditions.
Regarding the other statements:
- It does not conduct electricity. This is incorrect; mercury is a conductor of electricity, although not as good as some other metals.
- It does not chemically react with other elements. This is also not accurate; mercury can react with various substances, particularly with halogens and sulfur.
- It is not lustrous. Mercury is actually quite lustrous, having a shiny, reflective surface.
So, the unique characteristic of mercury is its liquid state at room temperature, which sets it apart from most other metals.
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