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Questions and Answers
Which scientist's model of the atom included electrons embedded in a sphere of positive charge, often referred to as the 'cookie dough' model?
Which scientist's model of the atom included electrons embedded in a sphere of positive charge, often referred to as the 'cookie dough' model?
- J.J. Thomson (correct)
- Neils Bohr
- John Dalton
- Ernest Rutherford
Rutherford's gold foil experiment primarily demonstrated what property of the atom?
Rutherford's gold foil experiment primarily demonstrated what property of the atom?
- The atom is mostly empty space with a dense, positively charged nucleus. (correct)
- The indivisibility of the atom
- The existence of neutrons
- The uniform distribution of positive charge
How did Bohr's model refine the understanding of electron behavior within an atom?
How did Bohr's model refine the understanding of electron behavior within an atom?
- By disproving the existence of protons within the nucleus.
- By describing electrons as orbiting the nucleus in fixed energy levels. (correct)
- By illustrating the random motion of electrons within a positive sphere.
- By suggesting that electrons exist in a cloud of probability around the nucleus.
Which of the following sequences accurately represents the historical order of atomic discoveries?
Which of the following sequences accurately represents the historical order of atomic discoveries?
If an atom were magnified to the size of a football stadium, approximately how large would the nucleus be?
If an atom were magnified to the size of a football stadium, approximately how large would the nucleus be?
Flashcards
Who is Democritus?
Who is Democritus?
The first person to propose the idea of an atom.
Dalton's Atomic Model
Dalton's Atomic Model
Atoms are indivisible and are small, solid spheres.
J.J. Thomson's discovery?
J.J. Thomson's discovery?
Discovered electrons and proposed the plum pudding model of the atom.
Rutherford's key discovery?
Rutherford's key discovery?
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James Chadwick is known for?
James Chadwick is known for?
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Study Notes
- Democritus originated the concept of the atom.
- John Dalton determined atoms to be small, spherical objects.
- J.J. Thomson identified the electron, suggesting atoms possess a positive charge and proposed the "cookie dough" model.
- Ernest Rutherford discovered the nucleus and protons, establishing that atoms consist mainly of empty space.
- James Chadwick discovered the neutron.
- Niels Bohr found that electrons cannot exist between orbitals, with orbitals nearer to the nucleus having lower energy levels.
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