Early Atomic Theory

JJ Thomson was credited for the discovery of the

• center of the universe

• proton

• electron

• neutron

Which device did JJ Thomson use to discover the electron?

• X-ray machine

• scanning tunneling electron microscope

• spectrometer

• cathode ray tube

The atomic model associated with Thomson is the

• plum pudding model

• nuclear mode.

• planetary model

• the electron cloud model

The CRT when powered up produces a beam that is

• red in color and positively charged.

• magnetic and negatively charged.

• deflected only when exposed to certain frequencies of light.

• red, blue, or green.

If a magnet is placed next to a cathode ray the ray or beam will be

• absorbed by the magnet.

• transformed to potential energy.

• less intense and blue in color.

• deflected by the magnetic field.

In what location did Rutherford suggest the electrons were located?

• in the nucleus.

• outside the nucleus.

• only where the alpha particles were deflected.

• outside the atom after they collided with the alpha particle.

Rutherford used what type of radiation to bombard the gold foil?

• alpha particles.

• beta particles.

• gamma radiation.

• neutrinos.

What did Rutherford expect to happen to the alpha particles bombarding the gold foil?

• they would be absorbed by the gold.

• they would be deflected by the gold.

• they would go completely through the gold foil.

• the would be changed into beta radiation by the gold foil.

What evidence did Rutherford use to support the idea that the atom was mostly empty space?

• the vast majority of the alpha particles went through the foil unaffected.

• the vast majority of the alpha particles were deflected at 90 degrees.

• one alpha particle was deflected by the gold foil.

• beams of alpha particles were deflected by magnets.

The first universally accepted theory on atoms was proposed in 1803 by:

• Winston Churchill

• John Dalton

• James Bond

• J J Thomson