development of the atomic theory atoms. 460 bc - greek philosopher proposes the existence of the...
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DEVELOPMENT OF THE ATOMIC THEORY
ATOMS
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•460 BC - Greek philosopher proposes the existence of the atom
•He pounded materials until he made them into smaller and smaller parts
•He called them atoma which is Greek for “indivisible”.
Democritus
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• His Theory:
All atoms:
• Are small hard particles
• Are made of a single material formed into different shapes and sizes
• Are always moving, and they form different materials by joining together
Democritus
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•1803 - British chemist; elements combine in specific proportions to form compounds
John Dalton
Solid Sphere Model or
Bowling Ball Model
Proposed by John Dalton
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• His Theory: All substances are made of atoms that cannot
be created, divided, or destroyed.
Atoms join with other atoms to make new substances.
Atoms of the same element are exactly alike, and atoms of different elements are different in mass and size.
John Dalton
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• 1897 - English chemist and physicist; discovered 1st subatomic particles
J. J. Thomson
Plum Pudding Model or
Raisin Bun Model
Proposed by J.J. Thomson
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•His Theory:•Atoms contain negatively charged particles called electrons and positively charged matter.
• Created a model to describe the atom as a sphere filled with positive matter with negative particles mixed in.
J. J. Thomson
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•1912 - New Zealand physicist discovered the nucleus
Ernest Rutherford
Nuclear Model
Proposed by Ernest
Rutherford
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Gold FoilExperime
nt
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•His Theory:Small, dense, positively charged particle present in nucleus called a proton
Electrons travel around the nucleus, but their exact places cannot be described.
Ernest Rutherford
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•1913 - Danish physicist; discovered energy levels
Niels Bohr
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•His Theory:Electrons travel around the nucleus in definite paths and fixed distances.
Electrons can jump from one level to a path in another level.
Niels Bohr
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•1924 - Austrian physicist; developed the electron cloud model
Erwin Shrodinger
Electron Cloud Model
Proposed by Erwin
Schrodinger
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•His Theory:The exact path of electrons cannot be predicted.
The region referred to as the electron cloud, is an area where electrons can likely be found.
Erwin Shrodinger
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• 1932 - English physicist; discovered neutrons
• His Theory: Neutrons have no electrical charge. Neutrons have a mass nearly equal to the mass of a proton.
Unit of measurement for subatomic particles is the atomic mass unit (amu).
James Chadwick
Neutrons in Nucleus
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• Atoms are composed of three main subatomic particles: the electron, proton, and neutron.
• Most of the mass of the atom is concentrated in the nucleus of the atom.
Modern Theory of the Atom
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• The protons and neutrons are located within the nucleus, while the electrons exist outside of the nucleus.
• In stable atoms, the number of protons is equal to the number of electrons.
Modern Theory of the Atom
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•The type of atom is determined by the number of protons it has.
•The number of protons in an atom is equal to the atomic number.
Modern Theory of the Atom
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• The sum of the number of protons and neutrons in a particular atom is called the atomic mass.
• Valence electrons are the outermost electrons.
Modern Theory of the Atom