These elements are used in color televisions and lasers due to a sharp emission spectrum in their 4f electrons.
These elements have high magnetic moments and form large trivalent cations. These elements are used in color televisions and lasers due to a sharp emission spectrum in their 4f electrons. Like the transition metals, this set of elements contains a single synthetic element; that element is prometheum. For 10 points, name these elements often found just above the actinides on the periodic table.
These elements have high magnetic moments and form large trivalent cations.
{lanthanides} [or {lanthanoids}]