Packet 1: Tossup 12

The (IV) (“four”) oxide of one of these elements is known as opticians’ rouge when used to polish glass. One of these elements names the strongest type of commercially-available permanent magnet. (15[1]-5[1])Poor (-5[2])shielding (15[1]-5[3])in (-5[1])these (15[1])elements’ (15[1]-5[1])4f orbital (15[1]-5[2])causes their atomic radii (-5[1])to undergo a namesake (15[1])(*) “contraction.” These elements (10[2])along with (10[1])scandium and yttrium (10[1])comprise the rare-earth elements. (-5[1])A Swedish village (0[1])lends its name to this series’ elements erbium, terbium, and ytterbium. For 10 points, name this series of 14 elements that appear above the actinides (10[3])on (10[1])the periodic table, (10[5])named for a metal symbolized La (10[1])■END■ (10[3])

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