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Chemistry Elements
How did John Dalton discover atomic weight? | By conducting the gas and diamond experiments. |
Who discovered the nucleus and discovered it had a positive charge, by conducting the gold foil experiment? | Ernest Rutherford |
Who discovered electrons, by conducting the cathode tube experiment? | J.J. Thomson |
Who discovered that electrons have to be in a specific place? (the outer shells) | Niels Bohr |
Who made the periodic table by organizing the elements by atomic mass? | Dmitri Mendeleev |
Who modified the periodic table by rearranging the elements by atomic number? | Henry Moseley |
What does Dalton's atomic theory state that we know now to be incorrect? | All atoms are NOT identical; atoms are not the smallest form of matter. |
What is the definition of an atom? | The smallest particle of matter that retains all properties of a element. |
The mass number is equal to ____ + ____ | protons neutrons |
Which sub-atomic particles make up the nucleus of an atom? | Neutrons and protons |
How many valence electrons do alkali metals have? | 1 |
What did John Dalton do? | Discovered Atomic Weight |