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What happen to atomic number and mass number of nucleus when it emits alpha particle electron and proton?
Wiki User
∙ 7y ago
It's been awhile for me, but this is how I remember it. It is not convenient for me to look it up right at the moment, so you may want to verify this. Emitting an alpha particle (2 proton 2 neutron), atomic number would decrease by 2 and Atomic Mass decreases by 4.
Electron emission means a neutron turns into a proton and electron, but the electron shoots out. The atomic number increases by 1 and atomic mass stays the same. Proton emission, well it loses a proton. So the atomic number decreases and mass decreases.
Wiki User
∙ 7y ago
Wiki User
∙ 7y agoAlpha particle: atomic number decreases by 2, the mass number decreases by 4.
Electron: atomic number does not change, mass number changes by a negligible amount.
Proton: atomic number decreases by 1, the mass number decreases by 1.
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What happen to atomic number and mass number of nucleus when it emits electron?
"Number" goes up by one, mass stays the same.
Problems with Rutherford model?
In Rutherford's model of the atom the electrons had a circular motion around the nucleus. By the laws of physics, if something is going in a circular motion then it must be accelerating and a particle that accelerates is losing energy. This means that the electrons that are revolving around the nucleus would eventually fall into the nucleus. Nucleus would eventually collapse. This does not happen therefore the Rutherford model was put aside.
What happens when an unstable nucleus give off particles and change its number of protons?
Fundamentally, the number of protons in a nucleus determines its chemical identity. Carbon, for instance, has six protons, and that makes it carbon, regardless of how many neutrons or electrons there might be. Uranium, on the other hand, has 92 protons. So, the simple answer is that, when an unstable nucleus, i.e. a radionuclide, changes its number of protons, it becomes a different element.Now, how that happens is much more interesting. There are several decay processes that involve a change in the number of protons.Beta-In beta- decay, the weak interaction causes a down quark in a neutron to change to an up quark. The neutron becomes a proton, and a W- boson is emitted, which subsequently decays to an electron and an electron antineutrino. This increases the atomic number by one, and leaves the atomic mass number unchanged. Carbon-14, for instance, becomes nitrogen-14 by beta- decay.Beta+In beta+ decay, an up quark in a proton is changed into a down quark. The proton becomes a neutron, and a positron and electron neutrino is emitted. This reaction requires energy, and will only happen if there is a certain amount of excess energy in the nucleus or if there is an inner shell (K or L) electron available to add energy in the process of electron capture, also known as K capture. This decreases the atomic number by one, and leaves the atomic mass number unchanged. Americium-238, for instance, becomes Plutonium-238 by beta+ decay, one of its decay schemes.Electron CaptureElectron capture is where an inner (K or L) shell electron is assimilated into the nucleus, contributing its energy, and changing a proton into a neutron. The atomic number decreases by one while the atomic mass number stays the same. In some cases, electron capture results in beta+ decay. In some cases, the positron emission is suppressed and you only get the electron neutrino, along of course with the proton conversion, depending on energy.Alpha and other fissionIn fission decay, the nucleus is split into two parts. You get two new elements.Alpha decay is a specific example of fission. In this case, a helium nucleus (two protons and two neutrons) is split off; and the atomic number is decreased by two, while the atomic mass number is decreased by four. Uranium-238, for instance, becomes Thorium-234 by alpha decay, one of its decay schemes.As far as fission decay in general, the actual split point is determined by complex relationships that I will leave out of this somewhat simple explanation.Photon emissionIn many cases of an underlying decay process, such as described above, the nucleus and/or electron cloud is left in an excited state. When this happens, it "wants" to shed its excess energy and return to ground state. This results in the emission of a photon with energy representing that energy change. If this process originates in the nucleus, the photon is called a gamma ray; if it originates in the electron cloud, the photon is called an x-ray.Delayed photon emissionUsually, if there is going to be a gamma ray, it occurs very quickly after the initiating event, typically within 1 x 10-12 seconds. Sometimes, in what we call a metastable state, the gamma emission is delayed, sometimes for a very long time. Technetium-99m, for instance, can participate in beta- decay, but the secondary gamma ray is delayed with a half-life of six hours, making it very useful in the medical imaging field.
What will happen if a compass is suspend next to a conductor that is not carrying an electron flow?
Nothing will happen.
Give an example in which the distance traversed by a particle is larger than the magnitude of its displacement in the same time?
This may happen when the particle moves back and forth.
What will happen to an atom is an beta particles emits or adds?
The beta particle will alter the electromagnetic field of the atom. An electron will add to the electromagnetic charge if emitted, and subtract from, if it is absorbed. A positron will do the opposite. The atomic nucleus will also change. an electron can convert a neutron to a proton if emitted, and a proton to a neutron if absorbed. The positron, again, will do the opposite.
What happen to atomic number and mass number of nucleus when it emits electron?
"Number" goes up by one, mass stays the same.
What happens to a radioactive nucleus when it emits gamma ray?
It's atomic number decreases by 2 (because it has lost two protons) but as an alpha particle is two protons and two neutrons the Atomic Mass decreases by 4.
What will happen inside the nucleus if there alpha particle radiation?
Two neutrons and two protons will split off from the main nucleus as the alpha particle, leaving a different element.
What will happen if an electron is brought near an alpha particle?
The alpha particle will grab the electron, making it a part of its electron cloud.? As a result, the helium atom (which is what an alpha particle is) transitions from a +2 charge to a +1 charge.?A second electron will bring the helium atom to neutral, non-ionic, charge.
What happen to a positively-charged alpha particle that comes near the positively-charged nucleus?
It will repel
What are the shortcomings of Rutherford's atomic theory?
Rutherford explained that all the positive charge was concentrated at the centre and the electrons revolved around it. But this theory was discarded as a charged particle undergoing circular motion would accelerate and an accelerating particle looses energy. Hence, the electron would fall into the nucleus and the atom will collapse. But this doesn't happen. So, Rutherford's model of atom was discarded.
What happen to atomic number and mass number of nucleus when it emits proton?
Both get decreased as At. no = No. of Protons & At. mass = No. of protons + No. of neutrons in the nucleus.
What would happen if an atom had more proton then electron?
alpha decay: the ejection of an alpha particle (two protons and two neutrons) Beta decay: the ejection of an electron, a neutron changes to a proton. Fission: The nucleus breaks into separate half of unspecified number of protons and neutrons.
What are drawbacks of Rutherford's atom model?
Rutherford explained that all the positive charge was concentrated at the centre and the electrons revolved around it. But this theory was discarded as a charged particle undergoing circular motion would accelerate and an accelerating particle looses energy. Hence, the electron would fall into the nucleus and the atom will collapse. But this doesn't happen. So, Rutherford's model of atom was discarded.
A postitvely charged praticle in an atom is called a?
The answer is an ion. An ion is what is left when the process of ionization has occured. Ionization is when an atom either gains or loses an electron, depending on the amount in its outer shell. There are many ways for this to happen including reacting with other atoms or absorbing radiation. An electron has a charge of 1-, therefore gaining an electron gives the ion a charge of 1- and losing an electron gives the ion a charge of 1+
Discuss with the use of examples the main differences between alpha and beta decay?
In alpha decay, an alpha particle (a helium nucleus - 2p+ and 2n0) is emitted from the nucleus of an atom. In beta decay, a neutron turns into a proton and an electron, and the electron (beta particle) is emitted from the nucleus of the atom.
