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Early Theories of Matter Quiz

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Questions and Answers

According to Democritus, what are the two main components of the universe?

Protons and electrons

Atoms and protons

Atoms and the void (correct)

Molecules and subatomic particles

What did Democritus believe atoms are?

Energy particles

Divisible and destructible particles

Indivisible and indestructible particles (correct)

Composite particles

How many elements did Democritus propose make up all things?

Three elements

Five elements

Four elements

Two elements (correct)

What was John Dalton's view on the divisibility of atoms?

Atoms are indivisible particles Signup and view all the answers

According to John Dalton, how are atoms of the same element?

Exactly alike Signup and view all the answers

Who was the first to propose the existence of negatively charged electrons?

J.J. Thomson Signup and view all the answers

What did J.J. Thomson believe about the distribution of charges within an atom?

Negative charges spread evenly among positive charge Signup and view all the answers

Who measured the charge of an electron using oil droplets?

Robert Millikan Signup and view all the answers

What is Rutherford's contribution to atomic theory?

Proposal of a nucleus containing protons and neutrons Signup and view all the answers

What did Robert Millikan measure in 1909 related to electrons?

The charge of an electron Signup and view all the answers