Write about copernicium atom.

     

Copernicium is a synthetic chemical element with the symbol Cn and atomic number 112.  Its known isotopes are extremely radioactive, and have only been created in a laboratory.  The most stable known isotope, copernicium-285, has a half-life of approximately 28 seconds.  Copernicium was first created in 1996 by the GSI Helmholtz centre for Heavy lon Research near Darmstadt, Germany.  It is named after the astronomer Nicolaus Copernicus.

     In the periodic table of the elements, copernicium is a d-block transactinide element and a group 12 element.  During reactions with gold, it has been shown to be an extremely volatile substance, so much so that it is possibly a gas or a volatile liquid at standard temperature and pressure.

     Copernicium is calculated to have several properties that differ from its lighter homologues in group 12, zinc, cadmium and mercury; due to relativistic effects, it may give up its 6d electrons instead of its 7s ones, and it may have more similarities to the noble gases such as radon rather than is group 12 homologues.  Calculation indicate that copernicium may show the oxidation state +4, while mercury shows it in only one compound of disputed existence and zinc and cadmium do not show it at all.  It has also been predicted to be more difficult to oxidize copernicium from its neutral state than the other group 12 elements, and indeed copernicium is expected to be the most noble metal on the periodic table.   Solid copernicium is expected to be bound mostly by dispersion forces, like the noble gases; predictions on its band structure are varied, ranging from a noble metal to a semiconductr or even an insulator.