Chlorine atom, in its third excited state, reacts with fluorine to form a compound X. The formula and shape of X are

$7\mathrm{Cl}=1{\mathrm{s}}^2,2{\mathrm{s}}^2,2{\mathrm{p}}^6,3{\mathrm{s}}^2,3{\mathrm{p}}_{\mathrm{x}}^2,3{\mathrm{p}}_{\mathrm{y}}^2,3{\mathrm{p}}_{\mathrm{z}}^1$

$\mathrm{Cl}=1{\mathrm{s}}^2,2{\mathrm{s}}^2,2{\mathrm{p}}^6,3{\mathrm{s}}^1,3{\mathrm{p}}_{\mathrm{x}}^1,3{\mathrm{p}}_{\mathrm{y}}^1,3{\mathrm{p}}_{\mathrm{z}}^1,3{\mathrm{d}}^1,3{\mathrm{d}}^{1}3{\mathrm{d}}^1$

                                             (3rd excited state)

Chlorine atom, in its third excited state, reacts with fluorine to form ClF₇. Its shape is pentagonal bipyramidal.