How do you work out how many electrons protons and neutrons an atom has?

Answer 1

if it is a discovered element, look up its atomic number. that is a count of the number of protons in an atom of that element. the number of protons can also be determined by the magnetic charge with no electrons.

Answer 2

The atomic number of an element is the number of protons in the nuclei of its atoms. In a neutral atom, the number of electrons equals the number of protons. The number of neutrons in an atom varies according to the isotope, which is identified by its mass number, which is the sum of protons and neutrons in the nucleus. To determine the number of neutrons in an atom of a particular isotope, subtract the atomic number from the mass number. Take for example the isotope carbon-14, whose mass number is 14. Carbon's atomic number is 6, so it has 6 protons and 6 electrons in its atoms. To determine the number of neutrons in the isotope carbon-14, subtract the atomic number 6 from the mass number 14, and you get 8 neutrons.