europium

American  

[yoo-roh-pee-uhm, yuh-] / jʊˈroʊ pi əm, jə- /

noun

Chemistry.

1. a rare-earth metallic element whose salts are light pink. Eu; 151.96; 63.

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europium British  

/ jʊˈrəʊpɪəm /

noun

1. a soft ductile reactive silvery-white element of the lanthanide series of metals: used as the red phosphor in colour television and in lasers. Symbol: Eu; atomic no: 63; atomic wt: 151.965; valency: 2 or 3; relative density: 5.244; melting pt: 822°C; boiling pt: 1527°C

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europium Scientific  

/ y-rō′pē-əm /

1. A very rare, silvery-white metallic element that is the softest member of the lanthanide series. It is used in making color television tubes and lasers and as a neutron absorber in nuclear research. Atomic number 63; atomic weight 151.96; melting point 826°C; boiling point 1,439°C; specific gravity 5.259; valence 2, 3.

2. See Periodic Table

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Etymology

Origin of europium

First recorded in 1900–05; Europe + -ium

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Example Sentences

See Examples For:

europium

The region holds deposits of many of the very elements China has placed under export controls: yttrium, scandium, erbium, europium, ytterbium, samarium, and lutetium.

From Barron's ● Oct. 24, 2025

Although you may not be familiar with the names of these rare earths - like neodymium, yttrium and europium - you will be very familiar with the products that they are used in.

From BBC ● Oct. 8, 2025

Researchers found that during the first three hours after adding the europium complex, larger changes in the lifetime of the light emission occurred in the more malignant cells.

From Science Daily ● Jan. 22, 2024

Yttrium and europium, for instance, light up iPhone displays and allow them to vibrate.

From Washington Post ● Jan. 13, 2023

He also noted suspicious similarities to data in a 2009 Physical Review Letters paper on superconductivity in europium under high pressures.

From Science Magazine ● Sep. 26, 2022

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