History Of The Atom Flashcards
Who proposed the first atomic theory?
John Dalton
What year did J.J. Thomson discover the electron?
1897
True or False: The plum pudding model proposed that electrons are embedded in a positively charged ‘soup’.
True
Fill in the blank: Ernest Rutherford conducted the gold foil experiment in _____.
1909
What did Rutherford’s gold foil experiment demonstrate?
The existence of a small, dense nucleus in the atom.
Who developed the planetary model of the atom?
Niels Bohr
Multiple Choice: Which model proposed that electrons travel in specific orbits around the nucleus? A) Plum pudding model B) Rutherford model C) Bohr model D) Quantum model
C) Bohr model
True or False: Dalton’s atomic theory included the idea that atoms of the same element are identical.
True
What fundamental particle did James Chadwick discover?
The neutron
Fill in the blank: The atomic model has evolved from Dalton’s solid sphere to the ____ model.
Quantum
Who first suggested that atoms could be divided?
Democritus
What did the discovery of the neutron contribute to atomic theory?
It explained the existence of isotopes.
Multiple Choice: Which of the following scientists is associated with the uncertainty principle? A) Dalton B) Rutherford C) Heisenberg D) Thomson
C) Heisenberg
What did Niels Bohr’s model improve upon in atomic theory?
It introduced quantized energy levels for electrons.
