Atomic Theory Answers
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Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below.What experimental evidence led scientists to change from the previous model to this one?
A
A few of the positive particles aimed at a gold foil seemed to bounce back.B
The colors of light emitted from heated atoms had very specific energies.C
Experiments with water vapor showed that elements combine in specific proportions.D
Cathode rays were bent in the same way whenever a magnet was brought near them.2
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The charged particles in the beams that Thomson studied came from atoms. As these particles moved away from their original atoms, they formed a visible beam. The current model of the atom includes protons, neutrons, and electrons.What is the best use of an atomic model to explain the charge of the particles in Thomson’s beams?
A
An atom’s negative particles are surrounded by positive matter, so the positive particles are easier to remove.B
An atom’s positive particles are surrounded by negative matter, so the negative particles are easier to remove.C
An atom’s smaller negative particles are at a distance from the central positive particles, so the negative particles are easier to remove.D
An atom’s larger positive particles are at a distance from the central negative particles, so the positive particles are easier to remove.3
Which statement belongs to Dalton’s atomic theory?
A
Atoms have a massive, positively charged center.B
Atoms cannot be created or destroyed.C
Atoms can be broken down into smaller pieces.D
Electrons are located in energy levels outside of the nucleus.Did you find these answers helpful?
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