General Studies I
Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal respectively?
|A||Lithium and mercury|
|B||Lithium and osmium|
|C||Aluminmium and osmium|
|D|| Aluminium and mercury
Osmium is a hard metallic element which has the greatest density of all known elements. It is twice as heavy as lead, and has a specific gravity of 22.59. (The specific gravity of lead is 11.35; gold is 19.32; and platinum is 21.45.)
Osmium has an atomic weight of 190.2 and its atomic number is 76.