Metals are solid except:
(A) Bromine
(B) Mercury
(C) Sodium
(D) Lead

Hint:The metals are malleable in nature as they can be beaten into sheets. They also have the tendency to get stretched into thin wires so they are ductile too. The metals are a good conductor of heat and electricity due to which copper wires are used in the transfer of electricity. The silver is considered to be a good conductor of heat whereas iron is considered to be the worst conductor of heat.

Complete answer:The metals have the tendency to be sonorous as when they are rung or hit by the object they produce a sound. They are hard and heavy with high melting and boiling point. They have high density and are opaque in nature neither transparent or translucent. The metals generally corrode easily and fast. They have the tendency to lose their electrons to attain the octet configuration of the nearest noble gas. They form metal oxides when they come in contact with oxygen. They are good reducing agents. The metals are solid in state because there is a strong force of attraction between the particles and they are bonded with a metallic bond with other atoms. But mercury is an exception here because it has a unique electronic configuration which tends to remove one electron due to which it forms weak bonds with the other atoms.

So the correct option is option (B).

Note:Mercury is a heavy metal known as quicksilver which has the colour of a silvery white liquid. It has high surface tension and is considered to be a good conductor of electricity. It is used in thermometers and in manufacturing of light and batteries. It is used in rat poisons and insecticides.