Name two metals:
(a) which have very low melting points,
(b) which are so soft that they can be cut with a knife.
(a) Gallium and Caesium are two metals which have very low melting points. The melting point is so low that they start to melt if kept in our palms.
(b) Sodium and potassium are two metals which are soft and can be cut with a knife. They belong to the group of alkali metals. (Group 1 elements)