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Unformatted text preview: calcium : carbon : hydrogen : oxygen, 1:2:6:4 3. Is carbon dioxide an element, compound or a mixture? Explain. 4. How many protons, neutrons and electrons are in fluorine-18? 5. Give an example of two representative elements from the same family that are both metals with only 2 valence electrons. 6. Give an example of an element that is in the same period as sulfur and that has larger ionization energy than sulfur. 7. Write the Lewis symbol of nitrogen. 8. Write the condensed ground-state electron configuration of Se. 9. Why does the body need sulfur? 10. What is wrong with the following statement: Nonmetals are more likely to lose electrons than metals and nonmetals are more likely to conduct electricity than metals....
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- Fall '09