Chapter 2: Problem 44
How many nonmetals are in the following periods? (a) period 2 (b) period 4 (c) period 6
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Carbon tetrachloride, \(\mathrm{CCl}_{4}\), was a popular dry-cleaning agent until it was shown to be carcinogenic. It has a density of \(1.589 \mathrm{~g} / \mathrm{cm}^{3} .\) What volume of carbon tetrachloride will contain a total of \(6.00 \times 10^{25}\) molecules of \(\mathrm{CCl}_{4}\) ?
Scientists are trying to synthesize elements with more than 114 protons. State the expected atomic number of (a) the newest inert gas. (b) the new element with properties similar to those of the alkaline earth metals. (c) the new element that will behave like the halogens. (d) the new (nontransition) metal whose ion will have a +2 charge. (e) the new element that will start period 8 .
Write the formulas for the following molecules. (a) methane (b) carbon tetraiodide (c) hydrogen peroxide (d) nitrogen oxide (e) silicon dioxide
Consider the following nuclear symbols. How many protons, neutrons, and electrons does each element have? What elements do \(\mathrm{R}, \mathrm{T},\) and \(\mathrm{X}\) represent? (a) \({ }_{14}^{30} \mathrm{R}\) (b) \({ }_{39}^{89} \mathrm{~T}\) (c) \({ }_{55}^{133} \mathrm{X}\)
Uranium- 235 is the isotope of uranium commonly used in nuclear power plants. How many (a) protons are in its nucleus? (b) neutrons are in its nucleus? (c) electrons are in a uranium atom?
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