At "normal" temperatures, Mercury is denser than any of those substances ... slightly more so than lead, somewhat more so than copper, and a lot more so than aluminium.
Aluminum is the lighter than mercury.
Mercury.
mercury
Mercury is the lightest planet, with a mass of 0.055 that of Earth.
Hydrogen is the lightest substance among these four elements. It has the lowest atomic number and atomic weight, making it the lightest element on the periodic table.
Mercury is the only liquid metal. Bromine comes under group 7 in the table and is therefore a Halogen. Bare in mind that this is only true at standard states.
Chemistry is a science; chemical properties are specific for each substance.
Hydrogen
In chemistry, bicarbonate is considered a basic substance.
Mercury is a pure substance, more specifically it is an element.
If Mercury (element) is heated then like every other substance it expands.