Quiz on the Concept of Atoms

What term did Democritus use to describe the smallest pieces of matter?

• Molecules

• Electrons

• Atomos

• Nucleus

Who dismissed Democritus's concept of atoms?

• Dalton

• Rutherford

• Aristotle

• Thomson

What was the significance of the year 1981 in the study of atoms?

• Atoms were first theorized.

• Atoms were first visible with scanning tunneling microscopes.

• Atoms were first named.

• Atoms were first divided.

What was John Dalton's profession?

• Physicist

• Chemist

• Biologist

• Mathematician

What was the name given to the negatively charged particles discovered by Thomson?

• Protons

• Neutrons

• Electrons

• Positrons

In Thomson's Plum Pudding Model, what is the 'pudding' made of?

• Positive charge

• Negative charge

• Neutral charge

• Electrons

What nationality was Ernest Rutherford?

• British

• American

• New Zealander

• Australian

What did many scientists initially believe about electric currents before Thomson's experiments?

• They were neutral

• They were positive rays

• They were magnetic fields

• They were chemical reactions

Who introduced the concept of the atom in 450 B.C.?

• John Dalton

• J.J. Thomson

• Democritus

• Ernest Rutherford

In what year did J.J. Thomson discover electrons?

• 1800

• 1897

• 1911

• 450 B.C.