The Chemistry of Life Section 2.1: The Nature of Matter Teacher: Mrs. Rolle Presenter: Mevan...

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.