Chemistry 10a
General Chemistry

Fall 2003

Errata in Textbook

Page 11, under subtopic "Arrangement":
Technically, the periodic table lists the elements in numerical order according to atomomic number (or proton number), and not according to mass (light to heavy). While it is generally true that they go from less to more massive, there are a few instances following natural abundances where this is not true. See for example the masses of Ar and K, or Te and I.

Page 48, 2nd paragraph, 8th line:
The droplets are not irradiated with X-rays. If they were, they would be positively charged. The chamber was illuminated with X-rays causing the air to ionize and "electrons" to attach themselves to the oil drops. That is why the droplets are negatively charged.

Pages 306 and 312, i.e. Figures 7-16 and 7-19:
The atomic sizes in Figure 7-16 are not measured the same way as the ionic sizes in Figure 7-19. These numbers are not directly comparable because they have different definitions of size.

Bottom of page 309:
Second last line. IE should be 1681 kJ/mol and not 168.

The answer to the section exercise 7.5.1, given at the end of the chapter, is wrong. It should be -2969 kJ/mole given the information in the question.


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Last modified: 28 Aug 2003