A rare silvery-white metallic chemical element with atomic number 64, used in medical imaging and some alloys.
Named in 1886 after gadolinite, a mineral itself named after Johan Gadolin, an 18th-century Finnish chemist who first isolated the element's oxide from the mineral.
Gadolinium is essential to MRI machines—it's injected into patients to light up tumors invisible to regular X-rays, making it a bridge between chemistry and saving lives.
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