NINI observed an element, with non-metallic character, liquid at room temperature and colour as orange-brown. The element would be Mercury

Bromine

Iodine

Gallium

Explanation:

bromine is correct answer

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.