You need to be more specific! Gypsum is a compound with the chemical formula CaSO₄·2H₂O. To determine the number of electrons and protons, we need to consider:

1. The elements involved: Gypsum is made up of calcium (Ca), sulfur (S), oxygen (O), and hydrogen (H).

2. The number of atoms of each element: In one molecule of gypsum, there is:

* 1 calcium atom (Ca)

* 1 sulfur atom (S)

* 4 oxygen atoms (O)

* 4 hydrogen atoms (H)

3. The atomic number of each element: The atomic number tells us the number of protons (and normally also the number of electrons) in a neutral atom:

* Calcium (Ca): Atomic number 20

* Sulfur (S): Atomic number 16

* Oxygen (O): Atomic number 8

* Hydrogen (H): Atomic number 1

Calculations:

* Protons:

* Ca: 1 atom * 20 protons/atom = 20 protons

* S: 1 atom * 16 protons/atom = 16 protons

* O: 4 atoms * 8 protons/atom = 32 protons

* H: 4 atoms * 1 proton/atom = 4 protons

* Total protons: 20 + 16 + 32 + 4 = 72 protons

* Electrons:

* In a neutral molecule, the number of electrons is equal to the number of protons.

* Total electrons: 72 electrons

Therefore, there are 72 protons and 72 electrons in one molecule of gypsum.