2. Atoms & Elements
The Atom
2. Atoms & Elements
The Atom
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- Multiple ChoiceWhich of the following atoms has the greatest number of protons?1171views
- Textbook Question
A charged particle moves between two electrically charged plates, as shown here.
(a) What is the sign of the electrical charge on the particle?
687views - Textbook QuestionWhich experiment and subsequent observation led to the discovery that atoms contain negatively charged particles, now known as electrons? (LO 2.10–2.12)(a) Oil is sprayed into a chamber and the speed at which the oil droplets fall is measured with and without an applied voltage. X rays in the chamber knock electrons out of air molecules. The electrons stick to the oil pro-ducing an overall negative charge on the drops. Adjusting the voltage changes the speed at which the negatively charged oil droplets fall. (b) When a high voltage is applied across metal electrodes at opposite ends of a sealed glass tube, a cathode ray is produced. The cathode ray is repelled by a negatively charged plate. (c) A radioactive substance emits alpha particles, which are directed at a thin gold foil. Most of the alpha par-ticles pass through the foil, but a few alpha particles are slightly deflected and some even bounce back toward the radioactive source. (d) The mass of different elements in a pure chemical com-pound are measured. Different samples of the compound always contains the same proportion of elements by mass.451views
- Textbook Question
An unknown particle is caused to move between two electrically charged plates, as illustrated in Figure 2.7. You hypothesize that the particle is a proton. (b) Would it be deflected by a smaller or larger amount than the b rays?
515views - Textbook Question
An unknown particle is caused to move between two electrically charged plates, as illustrated in Figure 2.7. You hypothesize that the particle is a proton. (a) If your hypothesis is correct, would the particle be deflected in the same or opposite direction as the b rays?
822views - Multiple ChoiceAn electron in the n=6 level of the hydrogen atom relaxes to a lower-energy level, emitting light of wavelength 93.8 nm. To which principal level did the electron relax?654views
- Multiple ChoiceIdentify if the statement below is true: There are 6 protons and 6 neutrons in the nucleus of a carbon-12 atom that are held by strong nuclear forces.543views
- Multiple ChoiceWhat electron transition in a hydrogen atom, starting from n = 8, will produce light of wavelength 389 nm?613views