A. According to the radical "Jin" of the Chinese character name "Iridium" of iridium element, it is a metal element, so statement A is correct;

B. According to the information in the periodic table of elements, the following number 192.2 is the relative atomic mass of the element, so statement B is correct;

C in atoms, the number of atoms = the number of nuclear charges = the number of protons = the number of extranuclear electrons. According to the number 77 in the upper left corner of the periodic table, if its atomic number is 77, there are 77 electrons outside the nucleus, so C is correct;

D according to the relative atomic mass ≈ proton number+neutron number, the neutron number of iridium is ≈192-77 =115, so d is wrong.

Therefore, choose: d.