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.
On the periodic table, there are two numbers for every element: the atomic number and the atomic weight. The numbers at the top of the square represents the number of protonâ¦s present in the atom's nucleus of that element. This is called the atomic number. For example, the atomic number for the element Krypton is 36.