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Atomic number is the number of protons in an atom. Mass number is the number of neutrons in an atom, and net charge describes how the protons and electrons balance out. Thank 107. Flag lesson. Tip: This isn't the place to ask a question because the teacher can't reply.
An atom is always charge less i.e it is neutral. An atom always refers to a single element. The atomic number of an element refers to the number of protons or electrons in it. This is because an atom always has equal number of electrons and protons. Protons are positively charged while electrons are negatively charged. Atoms also contain neutrons which are neutral. Proton, neutron and electron are called sub atomic particles. Neutrons and protons are called nucleons since they are in the nucleus of the atom. Charged species are called ions.