Protactinium's significance stems from the fact that it is the first actinide to possess a 5f electron, with intermediate properties between those of thorium and uranium. Its ground-state electron ...

In 1980, the International Atomic Energy Agency (IAEA) observed that protactinium, a chemical element generated in thorium reactors, could be separated and allowed to decay to isotopically pure ...

Atomic Number: 91 Atomic Symbol: Pa Atomic Weight: 231.03588 Melting Point: 2,862 F (1,572 C) Boiling Point: 7,232 F (4,000 C) Word Origin: The word protactinium comes from the Greek protos ...

This element should form a highest oxide X 2 O 5, like niobium and tantalum to which it should be analogous." The modern atomic weight for the predicted element, or protactinium as it is now known, is ...

The Nature Index 2024 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their ...

Protactinium's principal value is not in its commercial uses, but in providing new fundamental insights into the chemistry of the elements. Protactinium is an actinide element and sits between ...

Scientists demonstrated that a positively charged protactinium dioxide ion may not exist in aqueous solution like other highly charged actinides, such as uranium and plutonium. Found naturally ...

By comparing the experimental data of hyperfine peak wavelengths with theoretical models, Kröger was able to identify 20 new energy levels in protactinium's hyperfine structure.

The conversion is not direct, and involves the initial formation of thorium-233, which decays rapidly to protactinium-233, and then to uranium-233 over a period of about a month. Hence presumably ...