Question

Why mercury is considered as a metal ?

Answer 1

At room temperature or at standard conditions of temperature and pressure, mercury (Hg) is liquid which makes it the only metal in liquid form at these conditions

Mercury is a heavy, silvery-white liquid metal. Mercury is a metal because is has free electrons as do all metals. As a result it is a good conductor of electricity as are all metals. that's why it is called metal. it's a different thing that it is in liquid state at room temperature.