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|2. The common isotopes of carbon are 12C and 13C. The average mass of carbon is 12.01115 amu. What is the abundance of the 13C isotope?|
|3. If the abundance of 6Li (6.015121 amu) is 7.500% and the abundance of 7Li (7.016003 amu) is 92.500%, what is the average atomic mass?|
|4. What do the following have in common?
|(a)||They are isotopes of each other.|
|(b)||They are isomers of each other.|
|(c)||They are isoelectronic with each other.|
|(d)||They are different elements so they have nothing in common.|
|5. How many valence electrons does an oxygen atom have?|
|6. Fluorine atoms tend to…?…when they form chemical compounds with metals.|
|(c)||neither lose nor gain electrons…they usually share electrons equally with metals.|
|(d)||Fluorine atoms do not form compounds with other atoms…fluorine is an inert gas.|
|7. The identity of an element is determined by…|
|(a)||the number of its protons.|
|(b)||the number of its neutrons.|
|(c)||the number of its electrons.|
|(d)||its atomic mass.|
|9. Which of the following electron configurations represents the electron configuration for a magnesium cation…Mg2+?|
|11. The half-life of francium-212 is 19 minutes. How many minutes will it take for 1 gram of this isotope to decay to 0.125 grams?|
|12. The atom formed by the beta decay of carbon-14 is…|