How many neutrons are in neptunium 235?

142 neutrons
Neptunium-235 has 142 neutrons and a half-life of 396.1 days. This isotope decays by: Alpha emission: the decay energy is 5.2 MeV and the decay product is protactinium-231. Electron capture: the decay energy is 0.125 MeV and the decay product is uranium-235.

How many neutrons does NP 238 have?

144 neutrons
Pu-238 fuel and SRS. Different isotopes of a single chemical element are distinguished by the number of neutrons in their nuclei. For example, each atom of the Pu-238 isotope contains 144 neutrons, while each atom of the Pu-239 isotope contains 145 of these neutral particles.

How many protons does NP 238 have?

93 protons
A neptunium atom has 93 protons and 93 electrons, of which seven are valence electrons.

What does protactinium decay into?

Protactinium’s most stable isotope, protactinium-231, has a half-life of about 32,760 years. It decays into actinium-227 through alpha decay.

Is neptunium man made?

The majority of neptunium, however, is anthropogenic; that is, it is created as a byproduct of reactions in nuclear power plants. Scientists can extract neptunium from spent nuclear fuel in large quantities. Because of its long half-life of 2.14 million years, Np-237 is the most abundant isotope of neptunium created.

What are 2 interesting facts about neptunium?

It has five oxidation states, +3 to +7, each with a different colour in solution, ranging from violet to yellow green. It has no stable isotopes. Instead, it has 20 radioisotopes with a range of half-lives and mass numbers 225 to 244. Its longest living isotope is neptunium-237, with a half-life of 2.14 million years.

Is plutonium man made?

Plutonium is considered a man-made element, although scientists have found trace amounts of naturally occurring plutonium produced under highly unusual geologic circumstances. The most common radioisotopes. For example, uranium has thirty-seven different isotopes, including uranium-235 and uranium-238.

Is P metal or nonmetal?

Nonmetals include the nonmetal group, the halogens, and the noble gases. These elements have similar chemical properties to each other that distinguish them from the elements that are considered metals….List of Nonmetals.

15 P Phosphorus
16 S Sulfur
17 Cl Chlorine
18 Ar Argon

What element is the heaviest?

The heaviest naturally stable element is uranium, but over the years physicists have used accelerators to synthesize larger, heavier elements. In 2006, physicists in the United States and Russia created element 118.

What is the half life of neptunium 239?

Neptunium-239 was the first transuranium element produced synthetically and the first actinide series transuranium element discovered. This isotope has a beta-decay half-life of 2.3565 days, which forms daughter product plutonium-239 with a half-life of 24,000 years. Los Alamos National Laboratory, U.S. Department of Energy 4 Description

Which is the stable isotope of neptunium 237?

237 Np decays via the neptunium series, which terminates with thallium-205, which is stable, unlike most other actinides, which decay to stable isotopes of lead . In 2002, 237 Np was shown to be capable of sustaining a chain reaction with fast neutrons, as in a nuclear weapon, with a critical mass of around 60 kg.

What is the decay chain of neptunium 237?

Neptunium-237, after decaying to protactinium then to uranium, eventually decays to form bismuth-209 and thallium-205. Unlike most other common heavy nuclei which decay to make isotopes of lead this decay chain is known as the neptunium series.

Why is neptunium 237 used in neutron detectors?

Neptunium-237, which is produced in gram quantities as a by-product of the production of plutonium in nuclear reactors, is used in neutron detectors.