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.
Round off atomic weight to find mass number. The mass number is the total number of neutrons and protons in an element. . Mass number can be found by rounding off an elementâs atomic mass to the nearest whole number.