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 atomic number (number at the top) is the amount of protons and the amount of electrons. So if an element has an atomic number of 5, you know that it has 5 protons and 5 electrons. The atomic mass (number at the bottom) is the amount of protons and neutrons added together.