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The Chemistry of LifeThe Chemistry of LifeSection 2.1: The Nature of MatterSection 2.1: The Nature of Matter
Teacher: Mrs. RolleTeacher: Mrs. RollePresenter: Mevan SiriwardanePresenter: Mevan Siriwardane
September 27, 2007September 27, 2007
Atomic StructureAtomic Structure
Atomic StructureAtomic Structure
ELECTRON – negative,
mass nearly nothingPROTON –
positive, same mass as neutron
(“1”)
NEUTRON – neutral,
same mass as proton
(“1”)
The AtomThe Atom
Nucleus Electron
Shell or Orbit
The Atom HydrogenThe Atom Hydrogen
Proton Electron
Hydrogen has one proton, one electron and NO neutrons
The Atom HeliumThe Atom Helium
ElectronProton
Neutron
Helium has two electrons, two protons and two neutrons
Mass and atomic numberMass and atomic numberParticleParticle Relative MassRelative Mass Relative ChargeRelative Charge
ProtonProton 11 11
NeutronNeutron 11 00
ElectronElectron 00 -1-1
MASS NUMBER = number of protons + number of neutrons
SYMBOL
PROTON NUMBER = number of protons (obviously)
The Atom HeliumThe Atom Helium
ElectronProton
Neutron
Helium has two electrons, two protons and two neutrons
The Atom LithiumThe Atom Lithium
Protons
Neutrons
Electrons
The Atom BerylliumThe Atom Beryllium
Protons
Neutrons
Electrons
Beryllium has four electrons, four protons and five neutrons.
The Atom BoronThe Atom Boron
Protons
Neutrons
Electrons
Boron has five electrons, five protons and six neutrons.
The Atom CarbonThe Atom Carbon
Protons
Neutrons
Electrons
Carbon has six electrons, six protons and six neutrons.
The Atom NitrogenThe Atom Nitrogen
Protons
Neutrons
Electrons
Nitrogen has seven electrons, seven protons and seven neutrons.
The Atom OxygenThe Atom Oxygen
Protons
Neutrons
Electrons
Oxygen has eight electrons, eight protons and eight neutrons.
The Atom FluorineThe Atom Fluorine
Protons
Neutrons
Electrons
Fluorine has nine electrons, nine protons and ten neutrons.
The Atom NeonThe Atom Neon
Protons
Neutrons
Electrons
Neon has ten electrons, ten protons and ten neutrons.
