CHE 201 Study Guide - Final Guide: Chemical Formula, Oxyanion, Covalent Bond
Document Summary
Atomic number: the number of protons in the nucleus of each atom of an element. Also indicates the number of electrons in the atom --> atoms are neutral and contain the same number of protons and electrons. Chemical identity of an atom can be determined solely from the atomic number. Mass number: the number of neutrons and protons present in the nucleus of an atom of an elements. All atomic nuclei, besides hydrogen, contain both protons and neutrons. Nucleon: protons, neutrons, and electrons --> in other words, a particle within the nucleus. Mass number = number of protons + number of neutrons. Isotope: atoms that have the same atomic number but different mass numbers. Atomic ion: atom that has lost or gained one or more electrons, giving it a positive or negative charge. Cation: an ion with a net positive charge --> decrease in number of electrons.
