1) Who thought that atoms were like tiny solid spheres and came up with several other ideas that still serve as the foundation for modern chemistry? a) Dimitri Mendeleev b) John Dalton c) J.J. Thomson d) Ernest Rutherford e) Niels Bohr 2) Who was the first to arrange the elements in order of increasing atomic mass to create the first periodic table? a) Dimitri Mendeleev b) John Dalton c) J.J. Thomson d) Ernest Rutherford e) Niels Bohr 3) Who came up with the idea that electrons travel in energy levels orbiting the nucleus similar to the way planets travel around the sun? a) Dimitri Mendeleev b) John Dalton c) J.J. Thomson d) Ernest Rutherford e) Niels Bohr 4) Who thought that atoms are made of mostly empty space with positive charges in the center? a) Dimitri Mendeleev b) John Dalton c) J.J. Thomson d) Ernest Rutherford e) Niels Bohr 5) Who thought that atoms were made of a positively charged ball with negative charges scattered throughout? a) Dimitri Mendeleev b) John Dalton c) J.J. Thomson d) Ernest Rutherford e) Niels Bohr

History of Atomic Structure

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