Platinum (pt) is in the 78th position in the periodic table. a neutral atom of the element that comes just before platinum in the periodic table has electrons and protons.

The ansseer is Iridium.

The atomic number of iridium is 77 and it comes just before platinum (atomic number = 78).

In iridium,

The number of electrons = no. Of protons = 77.
The no. Of electrons and the no. Of protons is same as atomic number.