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Why are protons converted into neutrons during positron emission?
Wiki User
∙ 13y ago
Protons are converted into neutrons during positron emission to satisfy certain conservation laws, like charge and baryon number.
The following reaction takes place during positron emission:
p+ --> n + e+ + ve, where p+ is a proton, n is a neutron, e+ is a positron (antielectron), and ve is an electron neutrino.
Charge is +1 on both sides of the reaction, and so is conserved.
Baryonic number is 1 on both sides of the reaction (both the p+ and the n have baryonic numbers of 1), and so is conserved.
Also, lepton number is 0 on both sides of the reaction (e+ has a lepton number of -1 while ve has one of +1, thus adding up to zero), and so is conserved.
Wiki User
∙ 13y ago
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Why helium atom is the nuclear emission of the alpha radiation?
Both have 2 protons and 2 neutrons
The nucleus of an atom is constituted of?
Protons and Neutrons.
What conditions in the nucleus are likely to result in an atom undergoing radioactive decay?
A nucleus can be inherently unstable. It can absorb an energetic photon (photoactivation) and become unstable. It can capture positrons, electrons, neutrons, and protons and become unstable. Decay processes include: # Alpha emission, a high energy 4He nucleus # Beta emission, a high energy electron # Beta+ emission / Beta capture, either a positron is emitted or an electron is captured into the nucleus (Burp!) # Gamma emission, one or more high energy photons are emitted # Neutron emission, neutrons of varying energies may be ejected in the process of a heavy nucleus decay (even tritium).
What is protons and neutrons of carbon?
6 Protons and Neutrons.
Can atoms be broken down into smaller particles if Yes then what are the names of the particle?
Atoms consist of protons, neutrons, and electrons. Protons and neutrons, in turn, are made up of quarks.Atoms consist of protons, neutrons, and electrons. Protons and neutrons, in turn, are made up of quarks.Atoms consist of protons, neutrons, and electrons. Protons and neutrons, in turn, are made up of quarks.Atoms consist of protons, neutrons, and electrons. Protons and neutrons, in turn, are made up of quarks.
What does an isotope release as a beta particle?
Usually when isotopes undergo beta decay they emit an electron, but some isotopes emit a positron instead. This depends on the relative number of neutrons to protons in the isotope which type of beta particle is emitted. An excess of neutrons leads to the emission of an electron, while an excess of protons leads to the emission of a positron.
If the nucleus of an atom has a proton number of 6 and a mass number of 14 and it undergoes beta transmutation what will be the number of neutrons in the parent nucleus?
The results of beta transmutation will depend on which beta decay even occurs. If it's beta minus, a neutron will be converted into a proton and an electron will be ejected from the nucleus. The original atom with its 6 protons and 8 neutrons (6 + 8 = 14, the mass number as specified) will be an atom with 7 protons and 7 neutrons. In a beta plus decay event, a proton will be converted into a neutron and a positron will be ejected from the nucleus. The original atom with its 6 protons and 7 neutrons will be an atom with 5 protons and 8 neutrons. In addition to the ejected electron or positron, there will also be an ejected antineutrino or neutrino (respectively). Use the links below for more information on beta decay.
What is radioactivity types of radioactivity?
Radioactive decay has nothing to do with chemistry and therefore may not be a chemical reaction. But since matter changes its properties (they are even irreversibly) it is considered to be reaction of one (elemental) reactant. Most decay reactions are kinetically of zero order.Different types of radioactive decay include decay by alpha emission (emits an alpha particle, 2 protons and 2 neutrons), Beta - emission, and Beta + emission (positron emission or electron capture).Some radioactive materials also output gamma rays, protons, neutrons, and can decay by fission.
Do neutrons orbit outside the atom?
No, neutrons do not revolve around the nucleus. Protons and neutrons reside in the nucleus of an atoms. Electrons revolve around the nucleus. Beta emission the release of electron form the nucleus. Alpha emission is the emission of helium atom.
What is the nuclear equation radionclide X decays by alpha emission into radium-224?
Alpha emission means that an alpha particle (2 protons + 2 neutrons) are emitted, so the original nucleus has 2 protons and 2 neutrons more.
Why helium atom is the nuclear emission of the alpha radiation?
Both have 2 protons and 2 neutrons
Are all the radiations are electro magnetic radiations?
No, not all radiation is electromagnetic radiation, though some is. Exceptions: Neutron radiation - Emission of neutrons. Alpha decay - Emission of a helium-4 nucleus (2 protons and 2 neutrons). Beta radiation - Emission of electrons.
How many neutrons do protons have?
Neutrons are completely separate from protons, so neutrons do not have any protons, and protons do not have any neutrons.
The nucleus of an atom is constituted of?
Protons and Neutrons.
In beta Decay a neutron is converted into a proton and what?
In beta decay, the nucleus of the atom emits an electron. This is a new electron, not one of the electrons in the electron cloud. This does indeed have the effect of changing a neutron into a proton, because total charge has to be conserved - if a new negative thing exists, there has to be a new positive thing too. But the mass has to stay the same too - conveniently, protons and neutrons have almost the same mass.
Where does a positron originate?
A positron is an anti-matter electron. It appears as a result of a kind of radioactive decay we call beta plus decay. In an unstable nucleus that decays by this process, a proton is converted into a neutron. This will result in the subsequent release of a positron and an electron neutrino, a nuclear reaction mediated by the weak force. Let's look at an example. The isotope fluorine-18 is a radionuclide with a half-life of about 110 minutes. There are 9 protons in this nucleus (because it's fluorine) and 9 neutrons. It's atomic mass is 18, and that's where the 18 in fluorine-18 comes from, as you recall. When fluorine-18 undergoes beta plus decay, the weak force goes to work. One of the protons emits a positron (that anti-electron) and the electron neutrino we spoke of. Since the atomic number (number of protons) decreases by 1, it is no longer fluorine, but is now oxygen, which has 8 protons. Note that the atomic mass (the number of protons + neutrons) is still 18, and an oxygen-18 atom has appeared in this transmutation process. Note that the positron, being anti-matter, will shortly be attracted to an electron. When these two particles meet, they undergo what is called mutual annihilation. Their entire mass is converted into energy, and two high energy gamma ray photons will be produced.
What happens to an atom that experiences radioactive decay?
It loses mass.
