  The coupled cluster calculations with accounting for relativistic effects to
study spectroscopic and chemical properties of element 120 (E120) are
performed. Similar calculations for Ba are also done and they are in a good
agreement with the experimental data. Dissociation energies of diatomic X-H and
X-Au molecules, where X=E120, Ba, are calculated; for E120 they are found to be
$1.5\div2$ times smaller than those for Ba.
