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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
Created by: schlabie



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