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This is emission of an alpha particle which is a helium nucleus. Thus the atomic number decreases by two and the atomic weight by four, in such a radioactive decay

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Q: What type of nuclear reaction results in a single nucleus undergoing a decrease in atomic number and the release of a helium nucleus?
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Related questions

Which part of atom take part in nuclear reaction?

A nuclear reaction involves changes in the nucleus of an atom, and it is from the atomic nucleus that energy is released in a nuclear reaction.


How does the uranium and plutonium react in the nuclear reactor?

To set off a fission reaction (the reaction that occurs in a nuclear reactor), a person must first pump a neutron into a heavy nucleus. So if a neutron is pumped into a uranium or plutonium nucleus capable of undergoing fission, the nucleus splits in two, and releases more neutrons, which hit more nuclei, which in turn send out even more neutrons, thus setting off a chain reaction where every time a neutron hits a nucleus, the nucleus splits in two and sends out more neutrons.


A reaction in which small nuclei combine to form a heavier nucleus?

That is nuclear fission. An example is that of a Uranium-239 atom undergoing beta decay. That is, a neutron in the nucleus ejects and electron, becoming a proton, resulting in Uranium-239 becoming Neptunium-239.


Which nuclear reaction occurs when one nucleus splits into two nuclei?

Nuclear Fission


Is nuclear an adjective?

Yes, it is an adjective. It refers to a nucleus, as in nuclear reaction, or the central form, as in nuclear family.


Whats the nuclear reaction of fission?

The splitting of a nucleus atom


Does the explosion in a nuclear bomb count as a rapid chemical reaction?

No, a nuclear bomb involves a nuclear chain-reaction.A chemical reaction involves the orbiting electrons in an atom.A nuclear reaction involves the nucleus (hence "Nuclear") of an atom.


When a uranium nucleus breaks into fragments what type of nuclear reaction occurs?

In nuclear physics and nuclear chemistry, nuclear fission is a nuclear reaction in which the nucleus of an atom splits into smaller parts (lighter nuclei), often producing free neutrons and photons (in the form of gamma rays).


What is shot at an isotope's nucleus to trigger a nuclear chain reaction?

neutrons


Nuclear reactions change the composition of an atom's?

Nuclear reactions change the composition of an atom's nucleus, hence nuclear reaction.


What type of nuclear reaction involves one nucleus breaking into multiple nuclei?

Nuclear fission


What is necessary sustain a nuclear chain reaction?

In a chain reaction, neutrons released during the splitting of an initial nucleus trigger a series of nuclear fissions.