Strontium (element), (formerly Cerium)
鍶 centers on the chemical element strontium. The older association with cerium is a historical naming artifact and not a separate conceptual sense.
鍶 is a modern character created to represent the element strontium. It combines the metal radical 金 with 思, which likely contributes the sound シ or ショウ.
The metal radical 金 on the left marks it as a metallic element. The right side 思 (think) can remind you that strontium was once confused with cerium, so you have to think carefully to tell them apart.
For ショウ, imagine a chemist showing a sample of strontium: show -> ショウ, and the metal gleams under the lab light.