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Nickel Nickel is a chemical element; it has symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is a hard and ductile transition metal

Berkelium Berkelium is a synthetic element chemical; it has symbol Bk and atomic number97. It is a member of the actinide and transuranium element series.

Polonium Polonium is the chemical element with atomic number 84 and its symbol is Po. It is an extremely radioactive and rare semimetal, chemically similar to tellurium and bismuth and is found in uranium ores