The atom’s valence shell contains electrons. Electrons are negatively charged particles that orbit the nucleus of an atom. In order to determine how many electrons there are in the valence shell, first we need to know what an electron is. An electron is a particle with a negative charge equal in magnitude but opposite in sign to that of the proton. The number of protons determines the atomic number (Z) and defines which chemical element it is. Z is usually equal to the number of protons in an atom. The valence shell contains electrons. Electrons are negatively charged particles that orbit the nucleus of an atom. In order to determine how many electrons there are in the valence shell, first we need to know what an electron is. An electron is a particle with a negative charge equal in magnitude but opposite in sign to that of the proton. The number of protons determines the atomic number (Z) and defines which chemical element it is. Z is usually equal to the number of protons in an atom; this means atoms have no more or less than one outermost energy level or valance shell for any given element type.[[br]] [[br]

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