Name metal. that exist in liquid state
and why acids should not me stored in metal containers

Very pure gallium is a silvery blue metal that fractures conchoidally like glass. Gallium liquid expands by 3.10% when it solidifies; therefore, it should not be stored in glass or metal containers because the container may rupture when the gallium changes state.

When liquid (at m.p.): 6.095 g/cm3

Oxidation states: −5, −4, −3, −2, −1, +1, +2, +3 (an amphoteric oxide)

Ionization energies: 1st: 578.8 kJ/mol; 2nd: 1979.3 kJ/mol; 3rd: 2963 kJ/mol; (more)

Appearance: silvery blue

1. Mercury is the metal that exists in liquid state.

2. Acids should not be stored in metal containers because most of the time acid reacts with almost every metal and produces salts or oxides.

your picture is not part of the scientific method.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.