10 Questions
According to Democritus, what are the two main components of the universe?
Atoms and the void
What did Democritus believe atoms are?
Indivisible and indestructible particles
How many elements did Democritus propose make up all things?
Two elements
What was John Dalton's view on the divisibility of atoms?
Atoms are indivisible particles
According to John Dalton, how are atoms of the same element?
Exactly alike
Who was the first to propose the existence of negatively charged electrons?
J.J. Thomson
What did J.J. Thomson believe about the distribution of charges within an atom?
Negative charges spread evenly among positive charge
Who measured the charge of an electron using oil droplets?
Robert Millikan
What is Rutherford's contribution to atomic theory?
Proposal of a nucleus containing protons and neutrons
What did Robert Millikan measure in 1909 related to electrons?
The charge of an electron
Test your knowledge on the early theories of matter proposed by Democritus, Aristotle, John Dalton, and others. Explore concepts such as atoms, elements, and the composition of the universe.
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