It is about Cf element. it is in the !8th group.
The last one.
Uranium I believe...
Radium (Ra).
Argon
Polonium
Now californium is considered as the heaviest naturally occurring chemical element.
hydrogen
It is the 117th element called Ununseptium. It is artificially synthesized. So heaviest naturally occurring halogen is Astatine.
The lightest element that is in period number 2 is lithium. Lithium is also the solid that is the least dense.
Polonium
This element is francium.
Francium (the element) is the heaviest element in the alkali metals group (Group I) of the periodic table.
Down the group the density generally increases. Thus radon will be the heaviest element.
Uranium
Barium is the heaviest element in the group 2 after Radium. Chemical symbol for barium is Ba. Atomic number of it is 56.
Mercury is the heaviest element at a liquid state.
The heaviest radioactively stable element in the same column of a wide form periodic table as nitrogen is bismuth.
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.
Ununhexium is the heaviest metal in the periodic table of elements. It is man made however, so it might not count. The heaviest natural metal might be Radium.
The information in the question 'What is the heaviest element?' should answer this. Access this by the web link below.