Planets Neptune

In November 1919 Einstein became the mythical figure he is to this day. In May of that year two solar eclipse expeditions had (in the words of the astronomer Eddington) confirm[ed] Einstein s weird theory of non-Euclidean space. On November 6 the president of the Royal Society declared in London that this was the most remarkable scientific event since the discoveiy [in 18461 of the predicted existence of the planet Neptune. ... 

Neptunium (Np, [Rn]5/46 /l7.v2), name and symbol after the planet Neptune. Discovered (1940, Berkeley) by Edwin M. McMillan and Philip H. Abelson. Silvery metal. 

Neptunium - the atomic niunber is 93 and the chemical symbol is Np. The name derives from the planet Neptune (the Roman god of the sea), since it is the next outer-most planet beyond the planet uranus in the solar system and this element is the next one beyond uranium in the periodic table.lt was first synthesized by Edwin M. McMillan and Philip H. Abelson in 1940 via the nuclear reaction n, y) U P = p. The longest half-life associated with this mistable... 

Neptunium, the first transuranium element, was discovered hy E. M. McMdlan and P. H. Ahelson in 1940 in Berkeley, California. It was produced in the cyclotron in a nuclear reaction by bombarding uranium-238 with neutrons. An isotope of mass 239 and atomic number 93 and ti/2 of 2.4 days was produced in this reaction. Neptunium-237, the longest-lived alpha-emitter with half-life 2.14x10 years, was discovered two years later in 1942 by Wahl and Seaborg. The new element was named after the planet Neptune, the planet next to Uranus in the solar system. 

Newtons law of gravitation played that ideal role for planetary astronomy during the eighteenth century. Once a planetary orbit had been calculated, based on the ideal relation between a planet and the sun, any deviation from the calculated path was immediately seen as a challenge to the law and became a focus of concerned attention to seek an explanation, usually found in the gravitational effects of other planets. The most spectacular example of this was the discovery of the planet Neptune from the deviations in the orbit of Uranus. 

Neptunium, the element beyond uranium, was named after the planet Neptune because this planet is beyond the planet Uranus for which uranium is named. 

Look up an account of the discovery of the planet Neptune. What can be said about the effectiveness of the factors in the models that described the motions of the planets other than Neptune What can be said about the lack of fit of these models to the available astronomical data How was the lack of fit accounted for ... 

Neptunium Np 93 E.M. McMillan, PH. Abelson United States From "the planet Neptune"... 

It was named in analogy to uranium after the planet Neptune. The Np isotope with the longest half-life (O/2 2.144 10 y) is Np, the mother nuclide of the (artificial) decay series with A = An + (section 4.1). It is produced in nuclear reactors ... 

In 1940, a pair of physicists at the University of California, Berkeley, were studying this problem. Edwin M. McMillan (1907—1991) and Philip H. Abelson (1913—2004) reported finding evidence of element number 93. They suggested naming it neptunium, in honor of the planet Neptune. (Uranium, the element before neptunium, had been named for the planet Uranus.)... 

In 1940, element 93 was discovered, or created, depending on how experimental research is described. The Berkeley team of Edwin McMillan (1907-1991) and Philip Abelson (1913-2004) bombarded uranium foil with neutrons and found that one of the fission products lasted for 2.3 days before naturally decaying. This did not match with known elements, and they suspected it was a new element. With 2.3 days to conduct tests, they were able to test oxidation states and positively identify that it was unique. The name neptunium was suggested because the planet Neptune was beyond Uranus. 

The name comes from Neptunus, the Latin name for the god of the sea, but it was named after the planet Neptune, which had recently been discovered. The element was first prepared in 1940 by Edwin M. McMillan and Philip Abelson at the Berkeley Laboratory of the University of California. They irradiated uranium with neutrons to create the new element. Neptunium does not exist in nature and is primarily of scientific interest. It is used in neutron detection equipment. 

Pisces The Basic Facts Polarity Negative Quality Mutable Element Water Symbol The Fish Ruling Planet Neptune Opposite Sign Virgo... 

Neptunium was discovered by the U.S. physicists Edwin M. McMillan and Phihp Abelson, in 1940, via the bombardment of with neutrons. The name of the element is related to the planet Neptune. Neptunium-237 occurs as a product of fission, and appears in uranium fuel elements. 

Neptunium was the first of these to be synthesised it was obtained in traces by bombardment of U(238) with neutrons (see Fig. 9(a), p. 318). Its chemical properties are not in general like those of rhenium or the other elements of Group vii. It yields no volatile oxide corresponding to RejO,. It functions with valencies 3, 4, 5 and 6 and in its higher stages of oxidation it tends to resemble uranium. Several isotopes are known including 237, 238 and 239. It was named after the planet Neptune discovered in 1846. 

In 1940, Edwin M. McMillan (1907-91) and Philip H. Abelson (1913-2004), working in Berkeley, bombarded uranium with cyclotron-produced neutrons, producing element 93, neptunium (Np). Neptunium was the first transuranium element to be reported. It is one beyond uranium in atomic number, hence the name, after the planet Neptune which is the one beyond Uranus. In the same year Glenn T. Seaborg (1912-99) and others in the Berkeley group discovered element 94, plutonium (Pu). Its potential for nuclear fission was soon apparent and the discovery was only... 

Pluto meets criteria (a) and (b) mentioned above, but it regularly encounters the orbit of the larger planet, Neptune, which is the technical reason used to remove Pluto s status as one of the planets of our solar system. It is probably worth noting that this resolution was met with some criticism, as even our own planet Earth encounters asteroids in its own orbit on a fairly regular basis. 

Adams, John Couch (1819-92) British astronomer who became professor of astronomy and geometry at Cambridge University in 1858. He is best known for his prediction (1845) of the existence and position of the planet Neptune, worked out independently the following year by Urbain Leverrier (1811-77). The planet was discovered in 1846 by Johann Galle (1812-1910), using Lever-rier s figures. Adams s priority was not acknowledged. 

The first transuranium element, number 93, was discovered in 1939 by Edwin M. McMillan (1907-1991) at the University of California while he was investigating the fission of uranium. He named it neptunium for the planet Neptune. In 1941, element 94, plutonium, was identified as a beta-decay product of neptunium ... 

---