History of the Atom

Mr. Anderson discusses the history and development of atomic theory, starting with Democritus and Dalton's early ideas, through J. J. Thomson's discovery of the electron, Rutherford's identification of the nucleus, and Bohr's model of atomic structure. The video also covers the evolution of quantum physics with contributions from Schrodinger and Heisenberg, explaining the dual nature of electrons as both particles and waves.

What is the approximate size of a nucleus in meters?

• 10 to the negative 10 meters

• 10 to the negative 15 meters

• 10 to the negative 5 meters

• 10 to the negative 20 meters

Who is credited with organizing the periodic table using playing cards?

• Mendeleev

• J. J. Thomson

• John Dalton

• Democritus

What did Democritus call the smallest indivisible part of matter?

• Neutron

• Proton

• Electron

• Atomos

Which scientist discovered the electron using a cathode ray tube?

• J. J. Thomson

• Chadwick

• Ernest Rutherford

• Niels Bohr

What was the key finding of Rutherford's gold foil experiment?

• Atoms are indivisible

• Existence of the neutron

• Discovery of the electron

• Presence of a dense nucleus

According to Bohr, how do electrons move around the nucleus?

• In random paths

• In a spiral

• In a straight line

• In specific orbits

What did Schrodinger propose about the nature of electrons?

• They are particles only

• They are waves only

• They have both particle and wave properties

• They are stationary