Presentation on theme: "IAN page 37 Atomic History Main Ideas 1. Democritus (13) 2. John Dalton (14) 3. Atomic Theories 4. JJ Thompson (15) 5. Cathode Ray Objective Identify &"— Presentation transcript:
IAN page 37 Atomic History Main Ideas 1. Democritus (13) 2. John Dalton (14) 3. Atomic Theories 4. JJ Thompson (15) 5. Cathode Ray Objective Identify & Interpret Atomic History by using notes & diagrams on IAN pgs to write a Schafer summary including all of the main ideas.
A. Democritus ( B.C.) all matter was made up of tiny pieces called "atomos"-- which is Greek for " that which cannot be broken down or further cut " Science went into a time of stagnation "the dark ages" 460 B.C. – 400 B.C. I. Theories about the Atom Aristotle (384 B.C B.C) disagreed with Democritus, he proposed that matter was uniform throughout and not composed of smaller particles.
B. John Dalton ( ) English scientist, proposed his atomic theories in
a. Elements are composed of tiny, discrete and indestructible particles called atoms. b. Atoms of the same element are identical. c. Atoms join with other atoms to make other substances. (Molecules)
Divide page 36 of your IAN into 3 ATOMIC MODELS
Solid Sphere Model
1. In 1897 JJ Thomson (1856 – 1940) discovered that atoms contain tiny, negatively charged particles called electrons. Cathode Ray Experiments. ( )