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The lightest element that is in period number 2 is lithium. Lithium is also the solid that is the least dense.
Mercury is the heaviest element at a liquid state.
The heaviest element in the periodic table (known in March 2013) is ununoctium.
The heaviest element that is highly radioactive is Ununoctium, which has an atomic number of 118.
its tell you the atomics mass that occurs
The information in the question 'What is the heaviest element?' should answer this. Access this by the web link below.
Granite.
Bismuth (Bi) is the heaviest nonradioactive element but the next heaviest is Lead (Pb) and that is much more commonly used. The heaviest element that is naturally occurring, and also usable, though radioactive, is Uranium (U).
The heaviest natural radioactive element is Uranium.Man made elements are continuously being made. The latest heaviest superheavyweight man made element to be discovered is element 117 (it is still so new that it hasn't been given a name yet).A little different bit of information about Fermium, a team has captured a piece of its spectrum-the wavelengths of light it absorbs-making it the heaviest element ever to be so measured. It was made in the 1952 detonation of the first thermonuclear bomb. It does not make it as the heaviest element, just the heaviest to have it's light spectrum captured.
Now californium is considered as the heaviest naturally occurring chemical element.
The heaviest element that can be produced prior to supernova is Iron (Fe).
This element is francium.