UNIT 3 PROJECT

ATOMIC THEORY

DEMOCRITUS

• He was a well known philosopher.
• He was born in Greece.
• He formulated an atomic theory for the universe.
• He was right that an atom cannot be cut.

ARISTOTLE

• Aristotle was a philosopher .
• He had a strong influence in people's thoughts.
• Aristotle was a great speaker.

DALTON

• John Dalton was a very famous scientist.
• Dalton’s atomic model is one of the fundamentals of physics and chemistry.
• He discovered that certain gases only could be combined in certain proportions.

J.J. THOMPSON

• Proved Dalton wrong that there are small particles inside an atom
• Plum pudding model

RUTHERFORD

• Gold foil experiment
• Discovered the nucleus

BOHR

• Studied the way atoms reacted to light
• Discovered electron levels

SCHRÖDINGER

• Discovered these regions called electron clouds

HIESENBURG

• Did the same thing Schrödinger did
• Discovered these regions called electron clouds

ATOMIC STRUCTURE

PROTONS

• Protons have a positive charge and are in the nucleus.
• The number of protons can be seen by the atomic number.

NEUTRONS

• Neutrons have no charge and are in the nucleus.
• To know the number neutrons just subtract the protons from the mass number.

ELECTRONS

• Electrons has a negative charge.
• Electrons can be found outside the nucleus in electron clouds.

NUCLEUS

• In the middle of the atom and contains protons and neutrons.
• It is the mass number on the periodic table.

ELECTRON ORBITALS

• There are shells of electrons.
• 2,8,18. The first shell holds 2.
• The second shell holds 8 and rises by 8.
• The third holds 18 because 8+2=10 then 10+8= 18.

PERIODIC TABLE DESIGN

ATOMIC NUMBER

• The number of protons and neutrons in a atom.
• It is on the top left hand corner of the elements square.

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