Chapter 2: Problem 112
In what part of the atom does the strong nuclear force operate?
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Chapter 2: Problem 112
In what part of the atom does the strong nuclear force operate?
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(a) What isotope is used as the standard in establishing the atomic mass scale? (b) The atomic weight of boron is reported as 10.81, yet no atom of boron has the mass of \(10.81 \mathrm{amu}\). Explain.
The radius of an atom of gold \((\mathrm{Au})\) is about \(1.35 \AA\). (a) Express this distance in nanometers \((\mathrm{nm})\) and in picometers \((\mathrm{pm})\). (b) How many gold atoms would have to be lined up to span \(1.0 \mathrm{~mm}\) ? (c) If the atom is assumed to be a sphere, what is the volume in \(\mathrm{cm}^{3}\) of a single \(\mathrm{Au}\) atom?
Which of the following pairs of atoms are isotopes of one another? \((\) a \(){ }^{11} \mathrm{~B},{ }^{11} \mathrm{C}\); (b) \({ }^{55} \mathrm{Mn},{ }^{54} \mathrm{Mn} ;(\mathbf{c}){ }_{50}^{118} \mathrm{Sn},{ }_{50}^{120} \mathrm{Sn}\)
Write the chemical formula for each substance mentioned in the following word descriptions (use the front inside cover to find the symbols for the elements you do not know). (a) Zinc carbonate can be heated to form zinc oxide and carbon dioxide. (b) On treatment with hydrofluoric acid, silicon dioxide forms silicon tetrafluoride and water. (c) Sulfur dioxide reacts with water to form sulfurous acid. (d) The substance phosphorus trihydride, commonly called phosphine, is a toxic gas. (e) Perchloric acid reacts with cadmium to form cadmium(II) perchlorate. (f) Vanadium(III) bromide is a colored solid.
From the following list of elements-Ar, H, Ga, Al, Ca, Br, \(\mathrm{Ge}, \mathrm{K}, \mathrm{O}\) - pick the one that best fits each description. Use each element only once: (a) an alkali metal, (b) an alkaline earth metal, (c) a noble gas, (d) a halogen, (e) a metalloid, (f) a nonmetal listed in group \(1 \mathrm{~A},(\mathrm{~g})\) a metal that forms a \(3+\) ion, (h) a nonmetal that forms a \(2-\) ion, (i) an element that resembles aluminum.
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