protoactinium

[ proh-toh-ak-tin-ee-uhm ]

noun

, Chemistry.

1. protactinium.

protoactinium

/ ˌprəʊtəʊækˈtɪnɪəm /

noun

1. the former name of protactinium

Example Sentences

When it slowly decays radioactively, it yields protoactinium 231 and thorium 230, both of which attach themselves to sediment particles and sink slowly to the bottom.

From Time Magazine Archive

There they in turn decay, but protoactinium 231 decays faster than thorium 230.

From Time Magazine Archive

Last month Dr. von Grosse asked to have the world supply of protoactinium back for a while so that he could make more photographs.

From Time Magazine Archive

In shaping the tungsten thread to which the protoactinium clung, he was a little too rough.

From Time Magazine Archive

Slick-haired young Dr. Aristid von Grosse, research chemist of Chicago's Universal Oil Products Co., created a stir at a chemistry convention summer before last by exhibiting a speck, weighing one-tenth of a gram, of pure protoactinium which he had isolated.

From Time Magazine Archive