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Sample problems, exam keys and syllabus

Sample problems, exam keys and syllabus - Chemistry 211...

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Chemistry 211 Sample problems Atomic Structure : 1. An atom of the most common isotope of platinum, Pt 194 78 , has __ protons, ___ neutrons, and ___electrons. a. 194, 78, 78 c. 78, 194, 78 b. 78, 116, 78 d. 78, 116, 78 2. Which species has 30 electrons? 3. Which element is represented by + 2 55 25 X 4. Which statement is correct? 5. The number of neutrons in the - 2 80 34 X a. 32 c. 36 b. 46 d. 80 6. Which statement is correct? 7. Chlorine (Z = 17) can have a charge of +7; how many electrons would this ion have? 8. Chlorine (Z = 17) can have a charge of +7; how many protons would this ion have?
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9. An element has two naturally occurring isotopes with atomic abundances of 15% 23 X and 85% 24 X. The atomic mass should be closest to a. 23.7 c. 12.0 b. 22.3 d. 23.0 10. An element has two naturally occurring isotopes with atomic abundances of 85% 23 X and 15% 24 X. The atomic mass should be closest to
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