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

Example Sentences

"So if you take the whole periodic table, and start putting things together - like lead, aluminium, rubidium, einsteinium - there are billions of new alloys that you can now make that you couldn't make on Earth."

From BBC

Unlike in lighter elements, the large positive charge in einsteinium and other heavy elements causes electrons to travel at speeds that reach a sizable fraction of the speed of light.

From New York Times

Einsteinium is an element with a famous name that almost no one has heard of.

From New York Times

That is the second longest-lived version of einsteinium, with a half-life of 276 days.

From New York Times

With each delay, they had less einsteinium left to study.

From New York Times