The isotope 106 46Pd (106 on top and 46 on bottom) has

1. 60 protons.

2. 106 neutrons.

3. 46 neutrons.

4. 60 neutrons.

Can I also have an explanation as well plz

4. 60 neutrons.

Explanation:

The given isotopes;

         ¹⁰⁶₄₆Pd

In this isotope, we can deduce that the mass number is the superscript and the atomic number is the subscript;

     Mass number  = 106

     Atomic number  = 46

Mass number is the number of protons and neutrons in an atom;

       Mass number = Protons + neutrons

Atomic number is the number of protons

So,  Number of protons  = 46

Number of neutrons  = Mass number  - Atomic number

                                    = 106  - 46

                                     = 60

Number of neutrons  = 60

answer; protein;

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.