Atomic Theory Answers
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The modern model of the atom describes electrons in a little less specific detail than earlier models did. Why is it that being less sure about the placement of electrons in an atom is actually an improvement over earlier models?
A
Electrons do not follow specific paths, so describing the area where an electron is likely to be is more scientifically accurate.B
Electrons were thought to be negatively charged, but now scientists know that their charge depends on their energy level.C
The modern model is based on mathematical equations, so the results become less clear when the decimals are rounded.D
The position of electrons in atomic models has changed so much that it is better to have a less specific model than to be wrong again.2
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The atomic models after Dalton’s time included ideas about the atomic structure.Which atomic model that shows the atomic structure is missing from this set?
A
Niels Bohr’s modelB
Schrödinger’s modelC
Rutherford’s modelD
Thomson’s model3
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.4
Which scientist developed the first model of the atom that proposed the structure of the inside of an atom?
A
DaltonB
BohrC
RutherfordD
Thomson5
The plum pudding model of the atom states that
A
each atom has an overall negative charge.B
each atom has a dense, positively charged center.C
an atom is a solid, indivisible sphere that makes up all matter.D
an atom is made up of electrons in a sea of positive charges.6
Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below.
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.Did you find these answers helpful?
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