2. When Moseley reordered the periodic table, what criteria did he use to order the elements?
3. What is the family name or term for:
a. Group 1A
b. Group 7A
c. Group 2A
d. elements in the series that includes Ce-Lu
e. elements in the B group
4. Rank these elements according to the radii of their atoms, from smallest to largest:
Na, Mg, Cl, K, and Rb
5. Rank the following atoms from smallest to largest: Si, Mg, Rb, Na
6. Identify the element on the periodic table that satisfies each description:
a. transition element with the largest atomic radius
b. alkaline earth metal with the greatest 1<sup>st</sup> ionization energy
c. most electronegative nonmetal
7. Select the element from each pair that is expected to have a lower 1<sup>st</sup> ionization energy:
a. N and F
b. Mg and Ba
c. N and Ca
8. Select the element from each pair that is expected to have greater metallic character:
a. K or Ca
b. B or Al
c. H or Fe
d. Fe or Cu
e. Mg or Ba
f. N or P
9. Which of Dalton's proposals has proved to be invalid?
10. How does the Thomson model of the atom vary from the Rutherford model of the atom? Which is
more accurate?
11. In the periodic table, element 20 is surrounded by elements 12, 19, 21, and 38. Which of these has
chemical and physical properties most resembling calcium?
