Atoms and Molecules - Ato ms and Mo le c ule s AAMNA KAMRAN...

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Atoms and Molecules AAMNA KAMRAN (Bsmc2k10)
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The Atom An atom is the smallest particle of an element. An atom is made up of three sub particles called the proton, neutron and electron. The center of the atom is the nucleus. The atomic no. is the no. of protons in an atom. The atomic weight is the sum of the protons and neutrons.
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The Atom The electron orbits around the outside of the nucleus in shells. An atom that is not neutral and has an electrical charge is called an ion. Thomson’s model of the atom. Rutherford’s model of the atom.
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The Proton Mass slightly less than that of a neutron=(1.6726X10^27). Charge=+1 Made up of three quarks , held together by gluons. Stable by itself.
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The Neutron No net electrical charge. Mass slightly larger then proton. Neutron no. determines of isotopes of that element(C 12 and C 14 ). Involved in nuclear fission and fusion to generate energy.
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The electron Extremely small Mass=(9.10x10^28)by J.J
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This note was uploaded on 01/17/2012 for the course MASS COMMU 107 taught by Professor Masror during the Spring '11 term at College of E&ME, NUST.

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Atoms and Molecules - Ato ms and Mo le c ule s AAMNA KAMRAN...

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