einsteinium

[ ahyn-stahy-nee-uhm ]

noun

, Chemistry, Physics.

1. a transuranic element. : Es; : 99.

einsteinium

/ aɪnˈstaɪnɪəm /

noun

1. a metallic transuranic element artificially produced from plutonium. Symbol: Es; atomic no: 99; half-life of most stable isotope, ²⁵²Es: 276 days

einsteinium

/ īn-stī′nē-əm /

1. A synthetic, radioactive metallic element of the actinide series that is usually produced by bombarding plutonium or another element with neutrons. It was first isolated in a region near the explosion site of a hydrogen bomb. Its longest-lived isotope is Es 254 with a half-life of 276 days. Atomic number 99; melting point 860°C.
2. See Periodic Table

Word History and Origins

Origin of einsteinium¹

1950–55; named after Albert Einstein; -ium

Word History and Origins

Origin of einsteinium¹

C20: New Latin, named after Albert Einstein