RadPhysics 3

Atomos means?

• Divisible

• Indivisible

• Group of atoms

• Small

Greek Atom

Four Essences: wet, dry, hot, & ______.

• Cool

• Icy

• Cold

• Chilly

Greek Atom

Four Substance: earth, water, fire, & ______.

• Light

• Air

• Energy

• Wind

How many substances/elements are identified?

• 20

• 92

• 112

• 129

How many substances/elements are naturally occurring?

• 20

• 92

• 112

• 129

How many substances/elements are artificially produced?

• 20

• 92

• 112

• 129

Particles smaller than atom.

• Subatomic Particles

• Atomic Particles

• Elements

• Nucleus

Hook-and-eye affair.

• Mendeleev Atom

• Neutral Atom

• Dalton Atom

• Bohr Atom

He showed that elements could be classified according to integral values of atomic mass.

• John Dalton (1809)

• John Dalton (1808)

• J.J. Thomson (1890)

• J.J. Thomson (1891)

First periodic table of elements.

• Dalton Atom

• Bohr Atom

• Dmitri Mendeleev

• Nucleons