From an X$-$Ray diffractogram of a pure element, the following

$2$ values in degrees were obtained: $38\mathrm{.}7,45\mathrm{.}4,65\mathrm{.}7,78\mathrm{.}8,$

$83\mathrm{.}099\mathrm{.}6,112\mathrm{.}5,117\mathrm{.}0,138\mathrm{.}1,164\mathrm{.}2.$ Copper K radiation

was used. Index these lines, find the crystal structure and

lattice parameter. Identify the element.