How to calculate atomic number?

Calculate the number of neutrons. Now you know that atomic number = number of protons, and mass number = number of protons + number of neutrons. To find the number of neutrons in an element, subtract the atomic number from the mass number. read more

Answer: 1 Atomic number is the number of protons so the answer is 10. 2 It is also the number of electrons because, elements have no overall charge as the positive protons cancel out the negative electrons. In order for this cancellation to happen, the number of protons and electrons must the same. read more

Calculate the number of neutrons. Now you know that atomic number = number of protons, and mass number = number of protons + number of neutrons. To find the number of neutrons in an element, subtract the atomic number from the mass number. Here are a couple example: A single helium (He) atom has a mass number of 4 and an atomic number of 2. read more

As everyone else has said, atomic number is the number of protons in the nucleus. At a basic level, the atomic mass is the number of protons plus the number of neutrons. read more