Development of Atomic Theory

Which Greek Philosopher believed that matter is composed of tiny particles called atoms?

• Democritus

• Aristotle

• Phytagoras

• Plato

What is the charge of the nucleus?

• +

• -

• 0

The Gold Foil Method through scattering of alpha particles was used to discover what part of the atom?

• protons

• electrons

• neutrons

• nucleus

This particle is found in the nucleus and has no charge

• Neutron
• Proton
• Electron

This particle is found in the nucleus and has a positive charge

• Electron
• Proton
• Neutron

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Tomson
• Ernest Rutherford
• John Dalton
• Democritus

Place the following scientists in order, from earliest to latest: 
A) Ernest Rutherford
B) J.J. Thomson
C) John Dalton

• B,C,A
• C,A,B
• A,C,B
• C,B,A

Which statement is true according to current thinking?

• An atom is mostly empty space.
• An atom is a collection of particles, so tightly packed that there is little empty space.
• The atomic nucleus is very mobile, and moves around inside a cloud of electrons.
• The size of atoms changes over time, pulsating from large to small to large again.

What particle was used in the gold foil experiment?

• Beta Particle
• Alpha particle
• Gamma ray 

Most of the alpha particles went straight through the gold foil.  This suggested that....

• There is no interference between alpha and gold.
• Most of the atom is made up of empty space.
• The alpha particles were very tiny.
• None of the above