physical-world
Liquid near room temp (non-metal)
Bromine
physical-world
Most abundant metal in crust
Aluminium
physical-world
Densest element
Osmium
physical-world
Most expensive natural element
Rhodium
physical-world
Least stable naturally occurring isotope
Polonium-212
physical-world
Lowest melting point (solid element)
Mercury
physical-world
Softest metal
Cesium
physical-world
Most reactive with water
Cesium / Rubidium
physical-world
Most flammable metal
Potassium
physical-world
Heaviest naturally occurring element
Uranium