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[John Downe]

Physical Science
Cathode Ray Tubes
Cathode Ray Tube
Plum Pudding Model
Flash cards (20)
The first model of the atom was developed through
thinking about the smallest particles of matter without experimenting.
Jerome is learning how the model of the atom has changed over time as new evidence was gathered. He has images of four models of the atom, but they are not in the correct order. In what order should Jerome put these models to show the development from the earliest model of the atom to the most recent one?
Y, X, Z, W
The model of the atom has changed as scientists have gathered new evidence. Four models of the atom are shown below, but one important model is missing. Which atomic model is missing from this set?
Dalton"s model
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?
The colors of light emitted from heated atoms had very specific energies.
What new characteristic did John Dalton add to the model of the atom?
An atom can join with other kinds of atoms.
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 to the development of this atomic model from the one before it?
A few of the positive particles aimed at a gold foil seemed to bounce back.
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 to the development of this atomic model from the one before it?
Cathode rays were bent in the same way whenever a magnet was brought near them.
Why did Thomson's results from experimenting with cathode rays cause a big change in scientific thought about atoms?
His results gave the first evidence that atoms were made up of smaller particles.
A cathode ray tube is made of glass with a small amount of some kind of gas in it. It has metal electrodes at each end to pick up pick up an electric current. The electrodes are named "positive" and "negative," which were words used by Benjamin Franklin in the 1700s to describe electricity. A bright ray forms in the gas when an electric current is applied to metal electrodes. In the 1800s, an important scientist suspected that the negatively charged particles in a cathode ray were present in all atoms.

What procedure would allow that scientist to investigate this idea?
making cathode ray tubes out of different materials to see if the ray is the same
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?
Electrons do not follow specific paths, so describing the area where an electron is likely to be is more scientifically accurate.
Who described atoms as small spheres that could not be divided into anything smaller?
Dalton
What did Rutherford's model of the atom include that Thomson's model did not have?
a nucleus
Oppositely charged objects attract each other. This attraction holds electrons in atoms and holds atoms to one another in many compounds. However, Ernest Rutherford's model of the atom failed to explain why electrons were not pulled into the atomic nucleus by this attraction.

What change to the atomic model helped solve the problem seen in Rutherford's model?
Bohr's work with atomic spectra led him to say that the electrons were limited to existing in certain energy levels, like standing on the rungs of a ladder.
What did Bohr's model of the atom include that Rutherford's model did not have?
energy levels
The plum pudding model of the atom states that
an atom is made up of electrons in a sea of positive charges.

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