Chemistry Evolution of The Atomic Model Quiz Study Guide

What is J.J. Thomson's Atomic Model?

1. Atoms are made mostly out of (+) Charged Material, like Dough in a Bun 2. The (-) Charged Electrons are found inside the (+) Dough

What is John Dalton's Atomic Theory?

1. Atoms are tiny, invisible Particles 2. Atoms of One Element are all the same 3. Atoms of different Elements are different 4. Compounds form by combining Atoms

What did John Dalton (1808) do?

1. He created the very first Atomic Theory 2. He was an English School Teacher who performed many experiments on Atoms He viewed Atoms as tiny, solid Balls 3. His Atomic Theory had 4 Statements

What did J.J. Thomson (1897) do?

1. He discovered Electrons 2. He was the first Scientist to show that the Atom was made of even smaller things 3. He also proposed the existence of a (+) Particle 4. His Atomic Model was known as "The Raisin Bun Model"

What did James Chadwick (1932) do?

1. He discovered Neutrons 2. Working with Ernest Rutherford, he discovered Particles with no charge 3. He called these Particles Neutrons 4. Neutrons are also found in the Nucleus

What did Ernest Rutherford (1911) do?

1. He discovered Protons and the Nucleus 2. He showed that Atoms have (+) Particles in the center, and are mostly empty space 3. He called these (+) Particles Protons 4. He called the center of Atoms the Nucleus

What did Neils Bohr (1913) do?

1. He improved on Ernest Rutherford's Model 2. He proposed that Electrons move around the Nucleus in specific Layers, or Shells 3. Every Atom has a specific number of Electron Shells

What did Democritus do?

1. He was a Greek Philosopher (470-380 B.C.) who is the father of Modern Atomic Thought 2. He proposed that Matter could not be divided into smaller pieces forever 3. He claimed that Matter was made out of small, hard particles called "Atomos"

Atomic Theory Timeline

1. John Dalton 2. J.J. Thomson 3. Ernest Rutherford 4. Neils Bohr 5. James Chadwick 6. The Modern Model

What was Ernest Rutherford's Experiment?

1. Most a Particles went through the Gold 2. The Atom is mostly empty space

What was Ernest Rutherford's Experiment?

1. Radioactive Material emits beam of (+) Alpha Particles 2. Most Particles went right through the Gold Foil 3. Strangely, some Particles are deflected

What was Ernest Rutherford's Experiment?

1. The Atom has a very dense (+) Center 2. He called it the Nucleus

How did The Atomic Theory start?

1. The Atomic Model had changed over time 2. For over Two Centuries, Scientists have created different models of of the Atom 3. As Scientists have learned more and more about Atoms, The Atomic Model has changed

What did The Modern Model (1932-) do?

1. Work done since 1920 has changed The Model 2. The New Atomic Model has Electrons moving around the Nucleus in a Cloud 3. It is impossible to know where an Electron is at any given time