Multiple Choice
Which of the following is the correct electron configuration for sulfur (atomic number 16)?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following best describes a cathode ray?
A
A beam of protons traveling from the anode to the cathode
B
A stream of electrons emitted from the cathode in a vacuum tube
C
A type of electromagnetic radiation similar to X-rays
D
A flow of neutrons produced by radioactive decay
Verified step by step guidance1
Understand the context of a cathode ray: it is related to early experiments with vacuum tubes and electric discharge.
Recall that a cathode ray is produced when a high voltage is applied across electrodes in a vacuum tube, causing particles to be emitted from the cathode (the negative electrode).
Identify the nature of these particles: cathode rays are streams of charged particles, specifically electrons, moving from the cathode toward the anode.
Eliminate incorrect options: protons are positively charged and do not travel from anode to cathode in this context; neutrons are neutral and not involved in cathode rays; electromagnetic radiation like X-rays is not a particle stream but a form of energy.
Conclude that the best description of a cathode ray is a stream of electrons emitted from the cathode in a vacuum tube.
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