How can we figure out the number of electrons

The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

Part 1 Calculating Protons, Electrons, and Neutrons

1. Get a periodic table of elements ...

2. Find your element on the periodic table ...

3. Locate the element's atomic number ...

4. Determine the number of electrons ...

5. Look for the atomic mass of the element ...

6. Subtract the atomic number from the atomic mass.

Is this the full question?