Essay Quiz


1		How was Mendeleev able to predict the chemical and physical properties of elements that were not yet discovered?



2		What is an isotope? Are all atoms isotopes? Explain.



3		Which of the following are whole numbers, and which are not whole numbers? Explain why for each. (a) atomic number (b) isotope mass (c) mass number (d) atomic weight



4		Why does the carbon-12 isotope have a whole-number mass but not the other isotopes?



5		What two things does a chemical symbol represent?



6		What do the members of the noble gas family have in common? What are their differences?



7		How are the isotopes of an element similar? How are they different?



8		What is the difference between a chemical change and a physical change? Give three examples of each.



9		What is an ion? How are ions formed?



10		What patterns are noted in the electron structures of elements found in a period and in a family in the periodic table?



11		What is a semiconductor?



12		Why do chemical families exist?

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