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The Chemistry of Life Section 2.1: The Nature of Matter Teacher: Mrs. Rolle Presenter: Mevan Siriwardane September 27, 2007 Atomic Structure Atomic Structure ELECTRON negative, ma nearly nothi NEUTRON – neutral, same mass as proton (“1”) PROTON – positive, same mass as neutron (“1”) The Atom Nucleus Shell or Orbit Electron The Atom Hydrogen Proton Electron Hydrogen has one proton, one electron and NO neutrons The Atom Helium Proton Electron Neutron Helium has two electrons, two protons and two neutrons Mass and atomic number Particle Proton Relative Mass 1 Relative Charge 1 Neutron Electron 1 0 0 -1 MASS NUMBER = number of protons + number of neutrons SYMBOL PROTON NUMBER = number of protons (obviously) The Atom Helium Proton Electron Neutron Helium has two electrons, two protons and two neutrons The Atom Lithium Protons Neutrons Electrons The Atom Beryllium Protons Electrons Neutrons Beryllium has four electrons, four protons and five neutrons. The Atom Boron Protons Neutrons Boron has five electrons, five protons and six neutrons. Electrons The Atom Carbon Protons Neutrons Carbon has six electrons, six protons and six neutrons. Electrons The Atom Nitrogen Protons Electrons Neutrons Nitrogen has seven electrons, seven protons and seven neutrons. The Atom Oxygen Protons Electrons Neutrons Oxygen has eight electrons, eight protons and eight neutrons. The Atom Fluorine Protons Electrons Neutrons Fluorine has nine electrons, nine protons and ten neutrons. The Atom Neon Protons Neutrons Neon has ten electrons, ten protons and ten neutrons. Electrons
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