The lanthanides and actinides refer to the two families of mostlyradioactive metalsin an off-shoot of the periodic table. Usually, they are shown as two rows on a separate section. The top row houses lanthanides, which are elements 57 – 70. The bottom row contains actinides, elements 89 ...
Hide element names and symbols and challenge students to complete the table. Even I have trouble with this one. Can you fill in the names of all ten categories of elements just by going by the symbols of elements in those categories?