You can access this free training by: 1  Go to https://pcau.enspark.com. 2  Complete Registration. Parents must select I am a Parent of a Student. 3  Click the Registration Button. 4  Click Launch Course. 5  Complete the one-hour training. 6  There will be a Certificate of Completion issued at the end of the course.
# of neutrons = Mass Number - Number of Protons. To be able to apply this formula, refer to the atomic number and atomic weight of the elements. These two are listed in the Periodic Table of Elements. Take note that atomic number refers to the number of protons in an atom of an element.
The number of protons and electrons (in a neutral atom) are equal to the atomic number of the atom. For example in a, the number of protons and electrons in magnesium is 12.To find neutrons, you take the atomic mass of the atom and subtract the number of protons.For Magnesium, you subtract 12 from 25 to find the number of neutrons, which in this case is 13.he number of protons and electrons (in a neutral atom) are equal to the atomic number of the atom. For example in a, the number of protons and electrons in magnesium is 12.