Neptunium is also found in trace amounts in uranium ores due to transmutation reactions.

Neptunium ( III ) hydroxide is not soluble in water and does not dissolve in excess alkali.

Neptunium ( III ) is susceptible to oxidation in contact to air forming neptunium ( IV ).

Neptunium hexafluoride, NpF < sub > 6 </ sub >, is volatile like uranium hexafluoride.

Neptunium is fissionable, and could theoretically be used as fuel in a fast neutron reactor or a nuclear weapon.

* Neptunium, the first transuranic element, is synthesized by Edwin McMillan and Philip H. Abelson at the University of California, Berkeley.

Neptunium ( Np ) is an artificial element, and thus a standard atomic mass cannot be given.

* Np, the chemical symbol for Neptunium

Neptunium has the largest liquid range of any element, 3363 K, between the melting point and boiling point.

Neptunium, like protactinium, uranium, plutonium, and americium readily forms a linear dioxo neptunyl core ( NpO < sub > 2 </ sub >< sup > n +</ sup >), in its 5 + and 6 + oxidation states, which readily complexes with hard O-donor ligands such as OH < sup >–</ sup >, NO < sub > 2 </ sub >< sup >–</ sup >, NO < sub > 3 </ sub >< sup >–</ sup >, and SO < sub > 4 </ sub >< sup > 2 –</ sup > to form soluble anionic complexes which tend to be readily mobile with low affinities to soil.

The addition of AHA greatly diminishes the extractability of Plutonium and Neptunium, providing greater proliferation resistance than with the plutonium extraction stage of the PUREX process.

Neptunium forms tri-and tetrahalides such as NpF < sub > 3 </ sub >, NpF < sub > 4 </ sub >, NpCl < sub > 4 </ sub >, NpBr < sub > 3 </ sub >, NpI < sub > 3 </ sub >, and oxides of the various compositions such as are found in the uranium-oxygen system, including Np < sub > 3 </ sub > O < sub > 8 </ sub > and NpO < sub > 2 </ sub >.

Neptunium ( named for the planet Neptune, the next planet out from Uranus, after which uranium was named ) was discovered by Edwin McMillan and Philip H. Abelson in 1940 at the Berkeley Radiation Laboratory of the University of California, Berkeley.

Neptunium ions in solution.

The drug's chemical name is listed, since most states require feed processors to use this name instead of the trade name on the feed tag.

In some instances, the trade name is shown in parentheses following the chemical name.

Even here there is room for some variation, for metal surfaces vary in smoothness, absorptive capacity, and chemical reactivity.

As is well known, detergent actives belong to the chemical class consisting of moderately high molecular weight and highly polar molecules which exhibit the property of forming micelles in solution.

On chemical grounds it seems most likely that iodide is first converted to Af and then to Af as the active iodinating species.

The chemical nature of the iodocompounds is discussed below ( pp. 76 et seq. ).

It is therefore necessary to consider the properties of pituitary TSH if the fragmentary chemical information about blood TSH is to be discussed rationally.

The importance of knowing in what chemical forms the hormone may exist is accentuated by the recent observation that there exists an abnormally long-acting TSH in blood drawn from many thyrotoxic patients ( Adams, 1958 ).

Whether this abnormal TSH differs chemically from pituitary TSH, or is, alternatively, normal TSH with its period of effectiveness modified by some other blood constituent, cannot be decided without chemical study of the activity in the blood of these patients and a comparison of the substance responsible for the blood activity with pituitary Aj.

The aim is to collect a very broad range of physical, chemical, morphological, and structural data for crystals on an encyclopedic scale and to seek all possible useful and revealing correlations of properties with internal structure.

The process in which the outcome of any one stage is known only statistically is also of interest, although for chemical reactor design it is not as important as the deterministic process.

It is a popular belief that alchemists made contributions to the " chemical " industries of the day — ore testing and refining, metalworking, production of gunpowder, ink, dyes, paints, cosmetics, leather tanning, ceramics, glass manufacture, preparation of extracts, liquors, and so on ( it seems that the preparation of aqua vitae, the " water of life ", was a fairly popular " experiment " among European alchemists ).

Experiments have been conducted to attempt the synthesis of ununennium ( Uue ), which is likely to be the next member of the group, but they have all met with failure .< ref name =" link "> However, ununennium may not be an alkali metal due to relativistic effects, which are predicted to have a large influence on the chemical properties of superheavy elements.

Each element has a specific set of chemical properties as a consequence of the number of electrons present in the neutral atom, which is Z ( the atomic number ).

The number of electrons in each element's electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior.

Hence it is the atomic number alone that determines the chemical properties of an element ; and it is for this reason that an element can be defined as consisting of any mixture of atoms with a given atomic number.

Argon ( ) is a chemical element with symbol Ar and atomic number 18.

The name " argon " is derived from the Greek word αργον meaning " lazy " or " the inactive one ", a reference to the fact that the element undergoes almost no chemical reactions.

Arsenic ( ) is a chemical element with symbol As and atomic number 33.

Antimony ( or ; ) is a toxic chemical element with symbol Sb and atomic number 51.

Actinium ( ) is a radioactive chemical element with symbol Ac and atomic number 89, which was discovered in 1899.

Another element to concern the choreographer is that of the visual devices of the theatre.

indeed, it is maintained that the sexual element in jazz, by freeing the listener of his inhibitions, can have therapeutic value.

The rocking, I realized, is the single element in the story that carries the erotic message, the unspoken and unconscious undercurrent that would mar the innocence of a child's fantasy and disturb the effects of the work if it were made explicit.

It is a matter of trying to sort out an earlier fourth-century Saxon element from the later, fifth-century mainstream of Anglo-Saxon invasions.

Although the United States and the U.S.S.R. have been arguing whether there shall be four, five or six top assistants, the most important element in the situation is not the number of deputies but the manner in which these deputies are to do their work.

The element is inserted in the discharge circuit in place of the exploding wire, and the calorimetric heating of the element is measured with high accuracy.

This is used as a reference for comparing the ohmic heating and the electrical energy obtained from the measured current through the element and the measured voltage across the element.

The Strategic Air Command is the principal element of our long-range nuclear capability.

Steinberg obviously has concluded that it is the lyric element which must dominate in this score, and he manages at times to create the effect of the whole orchestra bursting into song.

There is some indication from a limited number of interviews with members of the population that the element of power, primarily the voluntary influence of non-authoritative power, has been exerted on actors in the system, particularly in regard to mate selection.

Each cell except the last in the chain also contains the address of the Y-cell that is the next element of the chain ; ;

This element is often called `` strong hands ''.

A sixth element, not always considered, is intelligence.

Proponents of single elements tend to ensure predominance of that element without determining if it is justified, and the element with the most enthusiastic and vociferous proponents has assumed the greatest importance.

While one element is announcing progress, another is delineating its problems.

The advantages inherent in mine warfare justify as great an importance for this element as is accorded any of the other elements.

Of course, there is an element of training here: these gifted people, by concentration, study, guidance, have learned to develop their power.

the cinematic element of time is merely used to increase the realism of an object which would still be reasonably realistic in a still photo.

Science is fully competent to deal with any element of experience which arises from an object in space and time.