| 21. | If a hole associates itself with a neutral atom, that atom loses an electron and becomes positive.
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| 22. | Within the plasma, positive ions move toward the cathode while electrons and neutral atoms move toward the anode.
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| 23. | At the end of recombination, most of the protons in the universe are bound up in neutral atoms.
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| 24. | Molecules can also be generated by reactions between neutral atoms and molecules, although this process is generally slower.
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| 25. | In a neutral atom, the system will emit a photon of the difference in energy, since energy is conserved.
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| 26. | Bound-bound transitions occur when the ions and neutral atoms collide, transferring an electron from the atom to the ion.
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| 27. | Three types of particles are found within the arc plasma, consisting of electrons, positively ionized atoms, and neutral atoms.
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| 28. | The emission spectra of ions are different than of neutral atoms; the ions may emit in undesired spectral ranges.
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| 29. | The high temperature of the universe during this epoch prevented electrons and protons from combining to form neutral atoms.
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| 30. | The description of these phenomena is based on the wave properties of neutral atoms, confirming the de Broglie hypothesis.
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