Mercury

Mercury is a chemical element with a symbol Hg and the atomic number 80. This are heavy, silvery d-block element.
Mercury only occurs 0.08 parts per million.
==Isotopes==
Mercury have the seven stable isotopes: 196Hg, 198Hg, 199Hg, 200Hg, 201Hg, 202Hg and 204Hg. 202Hg is are more abundant, which percentage are 29.86%. 
40 radioisotopes has been characterized, which short half-lives been in the day.
Mostly the isotopes of mercury are observationally stable.