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Chapter 37: Q. 22 (page 1082)
Write the symbol for an atom or ion with:
a. five electrons, five protons, and six neutrons.
b. five electrons, six protons, and eight neutrons.
a. The atom.
b. The ion is.
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Explain why the observation of alpha particles scattered at very large angles led Rutherford to reject Thomson鈥檚 model of the atom and to propose a nuclear model.
An alpha particle (a bare helium nucleus with q=+2e) accelerates across a 100 V potential difference, starting from rest. What is the particle鈥檚 kinetic energy in eV when it reaches the negative electrode? This question requires no mathematics beyond what you can do in your head.
Figure 37.7 identified the wavelengths of four lines in the Balmer series of hydrogen.
a. Determine the Balmer formula n and m values for these wavelengths.
b. Predict the wavelength of the fifth line in the spectrum.
An oil droplet with excess electrons is observed between two parallel electrodes spaced apart. The droplet hangs motionless if the upper electrode is more positive than the lower electrode. The density of the oil is . What is the radius of the droplet?
How many electrons, protons, and neutrons are contained in the following atoms or ions: (a) , (b) , and (c) ?
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