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4, Chapter
atomic structure
Question | Answer |
---|---|
What is an atom? | Smallest particle of an element that retains the chemical properties of that element |
Who discovered the electron? | J. J. Thomson - 1897 |
Who discovered the nucleus? | Ernest Rutherford -1911 |
Who discovered the neutron? | James Chadwick - 1932 |
Where is the mass of the atom? | Nucleus |
The majority of the atom is what? | Empty space |
What is the difference of Democritus and Aristotle? | Democritus: basic particle (atom) Aristotle: Can always be broken down infinitely |
Rutherford's atomic model: | detected the tiny positive charge nucleus |