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Unformatted text preview: Ions are atoms that can only be formed when an atom gains or loses electrons. Cations are positive ions. They form by losing electrons. Generally are formed by metals. Anions are negative ions. Form by gaining electrons. Generally are formed by non metals. Isotopes are elements with the same number of protons but a diff number of neutrons, diff mass numbers, and diff atomic masses. Another way to say this is the atoms have the same atomic number but diff mass numbers. Protons are positively charged particles. The number of protons in an atom is equal to the atomic number. Therefore we identify atoms by the number of protons in their nucleus. They have a mass of 1amu. Neutrons are neutral particles. They help hold the nucleus together and determine the stability of the nucleus. The number of protons plus neutrons equals the mass number for the element. They have a mass of 1amu. Electrons are negatively charged particles. They are responsible for chemical properties of an atom. In a neutral atom the number of electrons equals the number of protons. Max Planck- energy is emitted and absorbed only in discrete amount, which Planck called...
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This note was uploaded on 10/29/2010 for the course GOVT 2302 taught by Professor Tran during the Fall '10 term at Texas State.
- Fall '10