Atomic Structure
This positively charged particle is found in the nucleus.
Proton
This scientist proposed the first modern atomic theory.
John Dalton
This state of matter has a definite shape and definite volume.
Solid
The change from a solid to a liquid.
Melting
When thermal energy is added, particles move _____.
Faster
This particle has no charge.
Neutron
Dalton believed all matter was made of these tiny particles.
Atoms
Particles slide past one another in this state of matter.
Liquid
The change from a liquid to a gas.
Evaporation or Vaporization
When thermal energy is removed, particles move _____.
Slower
This scientist discovered the electron using a cathode ray tube.
J.J. Thomson
Bohr proposed that electrons move in these around the nucleus.
Energy Levels
Particles move freely and fill their container in this state.
Gas
The change from a gas to a liquid.
Condensation
Why does ice melt when heated?
Particles gain energy and move farther apart.
This scientist discovered the nucleus through the Gold Foil Experiment.
Ernest Ruherford
Rutherford discovered that atoms are mostly this.
Empty Space
In this state, particles are packed closely together and vibrate.
Solid
The change from a liquid to a solid.
Freezing
Why does water boil?
Particles gain enough energy to escape as a gas.
The number of these particles determines the identity of an element.
Protons
Put these scientists in order from earliest to latest: Dalton, Thomson, Rutherford, Bohr.
Dalton-Thomson-Rutherford-Bohr
Compare the particle movement in solids and gases.
Solids vibrate in place while gases move rapidly and spread apart.
The phase change that occurs when water droplets form on the outside of a cold glass.
Condensation
A gas is heated in a sealed container. What happens to the particles?
They move faster and collide more frequently.