The atomic number for the element calcium (Ca) is 20. How many protons and electrons does each atom have?
By definition, the atomic number is the number of protons, massive, positively charged nuclear particles. If there are 20 positively charged nuclear particles, there MUST be 20 fundamental, negatively charged particles also associated with the ATOM. And there are; they are called ELECTRONS, which are conceived to orbit the nuclear core.
How do I know that there are such electrons? Well, because calcium, like all matter, is electrically neutral. For every positive charge, there is a negative charge. The mass of a single calcium atom is
Because an element can have varying numbers of neutrons, the identity of the element always depends on