A(n) __________ is a substance that cannot be broken down into simpler substances.

What nineteenth century scientist combined the idea of elements with the Greek theory of the atom?

A piece of metal that can conduct electricity is called a(n) __________.

How did J.J. Thomson know that the particles in the cathode-ray tube were negatively charged?

The small, negatively charged particles discovered by J.J. Thomson are called __________.

Which of the following best describes Thomson's model of the atom?

Ernest Rutherford experimented with alpha particles and thin gold foil to find out __________.

Where did Rutherford propose that the positive charge in an atom was located?

What particle in an atom is electrically neutral?

Which of the following models of the atom reflects the unpredictable motion of the electron?

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