QUIZ #6 - Atomic Theory (GenChem)

Who first suggested the existence of atoms?

• Dalton

• Democritus

• Rutherford

• Aristotle

What does the word "atomos" mean in Greek?

• Smallest unit

• Invisible

• Indivisible

• Indestructible

Which scientist is known for the Law of Definite Proportions?

• Lavoisier

• Proust

• Dalton

• Thompson

According to Dalton’s atomic theory, atoms of the same element are:

• Always different

• Indestructible but not identical

• Identical in every way

• Variable in mass

What instrument allows scientists to observe individual atoms?

• Mass spectrometer

• Cathode ray tube

• Scanning tunneling microscope

• Electron balance

What subatomic particle did J.J. Thomson discover using the cathode ray tube?

• Proton

• Neutron

• Electron

• Nucleus

What charge does an electron carry?

• Positive

• Neutral

• Negative

• Variable

Who discovered the neutron?

• J.J. Thomson

• Millikan

• Rutherford

• Chadwick

The relative mass of a proton is approximately:

• 0

• 1

• 1/1840

• 1840

The “plum pudding” model was proposed by:

• Rutherford

• Bohr

• Thomson

• Dalton