4.3. Isotopes and Atomic Mass http://www.ck12.org
Lesson Review Questions
- Describe in general terms how a mass spectrometer functions.
- CompleteTable4.3.
TABLE4.3:Table for Problem 2
(^1) H (^2) H (^3) H (^23) Na (^35) Cl (^14) C (^12) C
protons
electrons
neutrons
- What is the mass number of a tin atom that has 69 neutrons? Write its full symbol.
- How many neutrons are there in an atom of platinum with a mass number of 195?
- What is the mass number of a copper atom with 34 neutrons?
- How many protons, neutrons, and electrons are there in a^5928 Ni atom?
- Silicon has three isotopes with 14, 15, and 16 neutrons, respectively. What are the mass numbers and symbols
of these three isotopes? - A natural sample of boron consists of two isotopes. One has an exact mass of 10.0129 amu and its percent
abundance is 19.91. The other isotope, of mass 11.0093 amu, has a percent abundance of 80.09. Calculate the
average atomic mass.
Further Reading / Supplemental Links
- The History of the Discovery of Radiation and Radioactivity: http://mightylib.mit.edu/Course%20Materials/
22.01/Fall%202001/discovery%20of%20radiation.pdf - Two amazing X-ray stories: http://www.faltublog.com/2011/09/23/the-worlds-2-most-shocking-x-ray-stories
/ - Biography of Wilhelm Conrad Roentgen: http://www.nobelprize.org/nobel_prizes/physics/laureates/1901/ro
ntgen-bio.html - Radioactivity: http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/radact.html
- Bievre, P. de, and H. S. Peiser. 1992. ’Atomic weight’: The name, its history, definition, and units. Pure and
Applied Chemistry 64 (10):1535-1543. - Kotz, John, and Heith Purcell. 1991. Chemistry Chemical Reactivity. Orlando, FL: Holt, Rinehart and
Winston. - Partington, J. R. 1989. A Short History of Chemistry. 3 ed. New York: Macmillan. Reissued by Dover
Publications. - Wilhelm Conrad Roentgen - Biography: http://www.nobelprize.org/nobel_prizes/physics/laureates/1901/ro
ntgen-bio.html
Points to Consider
- In this chapter, we discussed the structure of the atom and saw that it contains a nucleus that consists of protons
and neutrons. The nucleus is surrounded by negatively charged particles called electrons. How do you think
electrons might be arranged around the nucleus?