Democritus thought that matter was made of tiny particles

According to John Dalton’s observations, when elements combine in a compound,

J.J. Thomson’s experiments provided evidence that an atom

Who provided evidence for the existence of a nucleus in an atom?

In an atomic model that includes a nucleus, positive charge is

Which statement about subatomic particles is NOT true?

Which of the following is unique for any given element?

The number of protons in one atom of an element is that element’s

To find the number of neutrons in an atom, you would subtract

Which statement is true about oxygen-17 and oxygen-18?

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