How many protons, neutrons, and electrons are in 195Pt2+ ?

The answer to your question is Protons = 78, Neutrons = 117, Electrons = 76

Explanation:

                                ¹⁹⁵Pt²⁺

Protons are equal to the atomic number, Platinum has an atomic number of 78 so the number of protons = 78.

The number of neutrons = Mass number - Number of protons

                                         = 195 - 78

                                         = 117

The number of electrons is equal to the number of protons - two, we know this because of the 2+ exponent next to the Platinum symbol.

Number of electrons = 78 - 2

                                  = 76