The Atom Quiz - LC Chemistry

Who is credited with the discovery of the electron?

• J.J. Thomson

• William Crookes

• John Dalton

• Ernest Rutherford

What did Democritus believe about tiny particles?

• They are positively charged

• They are indivisible

• They are divisible

• They are negatively charged

What was the conclusion of William Crookes' first experiment?

• Cathode rays are deflected by electric fields

• Cathode rays are positively charged

• Cathode rays contain particles with enough energy to move a paddle wheel

• Cathode rays travel in straight lines and produce a glow

What did J.J. Thomson's first experiment conclude about cathode rays?

• They are positively charged

• They are neutral

• They consist of negatively charged particles

• They do not deflect in electric fields

What did Robert Millikan determine using the oil drop experiment?

• The structure of the atom

• The mass of an electron

• The charge of an electron

• The existence of protons

What is the Plum Pudding Model of the atom?

• An atom is a dense nucleus with electrons orbiting around it

• An atom is composed of protons and neutrons in the nucleus

• An atom is a cloud of electrons with no nucleus

• An atom is a sphere of positive charge with electrons embedded randomly

What was the main observation from Rutherford's gold foil experiment?

• All alpha particles were reflected back

• All alpha particles were deflected at large angles

• Most alpha particles passed through undeflected

• All alpha particles passed through undeflected

What did Rutherford conclude about the structure of the atom?

• The atom has no internal structure

• The atom is composed of indivisible particles

• The atom has a small dense positive core called the nucleus

• The atom is a sphere of positive charge

Who is credited with the discovery of the neutron?

• J.J. Thomson

• Ernest Rutherford

• James Chadwick

• Robert Millikan

What did John Dalton propose about atoms?

• All atoms are divisible

• All matter is made up of very small particles called atoms

• Atoms are composed of electrons and protons

• Atoms have a dense nucleus