Atom Structure

How did electricity become thought to be related to atoms?

• Batteries were invented.

• Current through a salt solution changed the chemical nature of some atoms in the solution.

• Cathode ray tubes showed beams of neutrons.

• Cat fur caused amber rods to be charged.

Thompson found the beam of particles in a CRT was ____

Thompson determined the

• Charge of an electron

• Mass of an electron

• Charge to Mass ratio of electron

• Charge of a neutron

Chadwick discovered the

• electron

• neutron

• proton

• positron

Millikan discovered the

• Mass of a proton

• Mass of an electron

• Charge of an electron

• Spin of an electron

Rutherford discovered

• Electrons

• Neutrons

• A positive nucleus in atoms

• Electrons spun in orbits

Alpha particles are

• Negative charged

• Electrons

• Helium nuclei

• Hydrogen ions

What could not be explained by classical theory of electrons orbiting a nucleus? Pick all that apply.

• Blackbody radiation

• Photoelectric effect

• Line spectra of light from excited atoms

• Electron beams bending in a magnetic field

Why does the Bohr model require quantum theory?

• So opposite charges attract

• So discrete energy levels occur

• So atoms can hold multiple electrons

• So the nucleus can be positive

How are line spectra explained by the Bohr Model?

• Electrons are released at a particular energy.

• Electrons falling from a higher to lower energy level emit a light photon of a particular wavelength.

• Electrons moving to a higher energy level release light at a certain frequency.

• The nucleus emits photons that result in light waves that cause line spectra.