Thorium (element)
鋀 is a rare kanji created specifically to represent the chemical element thorium. Its meaning is limited to that element and has no broader conceptual center.
鋀 is a modern kokuji (Japanese-made kanji) created for the element thorium. It combines the metal radical 金 with the phonetic component 豆 (トウ), following the typical pattern for element names.
The metal radical 金 signals a metallic element, and 豆 (bean) hints at the reading. Picture a tiny bean-shaped piece of thorium metal.
For トウ, imagine a thorium bean that weighs a ton: ton -> トウ, and the heavy metal bean sits on the scale.