Problems are listed in approximate order of difficulty. A single dot (•) indicates straightforward problems involving just one main concept and sometimes requiring no more than substitution of numbers in the appropriate formula. Two dots (••) identify problems that are slightly more challenging and usually involve more than one concept. Three dots (•••) indicate problems that are distinctly more challenging, either because they are intrinsically difficult or involve lengthy calculations. Needless to say, these distinctions are hard to draw and are only approximate.
•• For the great majority of atoms, it is found that the atomic mass (in atomic mass units) is close to twice the atomic number (an observation we will explain in Chapter 16). (a) Using the data in the periodic table inside the back cover, verify this observation by computing the ratio
(atomic mass in u)/(atomic number)
for the elements with Z = 10, 20, ⋯, 90. Comment on your results. (b) In terms of the mass number A, your results should show that A is close to (or in some cases a bit more than) 2Z. What does this mean for the neutron number N in relation to the proton number Z?
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.