Neptunium in a sentence

Finely divided neptunium metal presents a fire hazard because neptunium is pyrophoric ; small grains will ignite spontaneously in air at room temperature.

However, as neptunium does in fact occur in nature in trace amounts, as demonstrated when it was found in uranium ore in 1952, it is possible that Hulubei and Cauchois did in fact observe neptunium.

In one study comparing the diffusion rates of neptunium(V), plutonium(IV), and americium(III) in sandstone and limestone, neptunium penetrated more than ten times as well as the other elements.

Natural occurrence Neptunium series, showing the decay products, including astatine-217, formed from neptunium-237 Astatine is the rarest naturally occurring element.

The most stable isotope of neptunium, neptunium-237, is a by-product of nuclear reactors and plutonium production.

The Charlie Hebdo hackers, whose operation Microsoft dubbed "Neptunium", offered the stolen subscriber database for sale online for 20 bitcoin, currently about $460,000, Microsoft said.

You might have heard of Neptunium, which is -- only would exist for a brief time.

All of the elements with higher atomic numbers have been first discovered in the laboratory, with neptunium and plutonium later also discovered in nature.

As the first isotope of neptunium to be discovered has such a short half-life, McMillan and Abelson were unable to prepare a sample that was large enough to perform chemical analysis of the new element using the technology that was then available.

Biological role and precautions Neptunium does not have a biological role, as it has a short half-life and occurs only in small traces naturally.

Due to its long half-life, neptunium will become the major contributor of the total radiotoxicity in 10,000 years.

For a long time, chemists thought that element 93 would be homologous to rhenium, making the discovery and identification of neptunium nearly impossible.

However, most of the neptunium that is produced as a reaction byproduct in nuclear power stations is considered to be a waste product.

If accurate, this would give neptunium the largest liquid range of any element (3535 K passes between its melting and boiling points).

It is the ninth product of the neptunium decay series as a daughter isotope of actinium-225.

Neptunium-237 is the most commonly synthesized isotope due to it being the only one that both can be created via neutron capture and also has a half-lifelong enough to allow weighable quantities to be easily isolated.

Neptunium metal is silvery and tarnishes when exposed to air.

Neptunium metal is very reactive.

Of the transuranic elements —those with atomic numbers greater than 92—only plutonium and neptunium occur naturally on Earth.

Once in the environment, neptunium generally oxidizes fairly quickly, usually to the +4 or +5 state.