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When they contain an excess of neutrons
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∙ 12y ago
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Most stable types of nuclei have an number of protons and an number of neutrons?
4 protons and 4 neutrons
Unstable atomic nuclei decay over time into stable nuclei causing a mineral to be?
radioactive
Nuclei that have an excess of netrons can become stable by emitting what?
Positrons
Why heavy nuclei are unstable?
Heavy, i.e. large, nuclei are unstable because their size is such that the attractive strong nuclear force starts to lose out over the repulsive effect of the electromagnetic interaction. The happens because the distance coefficient for the strong nuclear forces drops off more rapidly than does the electromagnetic interaction.
Which nuclei would be the least stable?
1 proton, 3 neutrons
What do a heavy nuclei need to remain stable?
More neutrons than protons.
What Nuclei would be most stable?
70 protons, 98 neutrons
What has the author Saeed Mohammadi written?
Saeed Mohammadi has written: 'Studies of NZ28 nuclei with stable and radioactive heavy ion beams'
Does radioactive isotopes have a stable nuclei?
Radioactive isotopes are not stable.
Why do nuclei decay?
To become stable
Most stable types of nuclei have an number of protons and an number of neutrons?
4 protons and 4 neutrons
Are the nuclei of final elements produced by nuclear decay more stable or less stable than the nuclei of original radioactive elements?
Of course they are more stable, therefore they formed naturally.
Which are more stable nuclei that have an even number of nucleons or nuclei that have an odd number of nucleons?
even
Unstable atomic nuclei decay over time into stable nuclei causing a mineral to be?
radioactive
Are more stable nuclei that have an even number of nucleons or nuclei that have an odd number of nucleons?
even
Why nuclear reactions occur?
Where the nucleus is not in a stable configuration, it may change spontaneously to try to achieve a more stable state. This results in radioactivity of alpha, beta, and gamma types usually, though there are other variations. Also some heavy nuclei such as Uranium 235 and Plutonium 239 are easily fissioned or split when a neutron is captured, because the binding energy of the resulting lighter nuclei is greater than that of the heavy one.
What provides the stability that occurs in larger atomic nuclei?
The most stable nuclei are iron and nickel, and that is due to the binding energy per nucleon being greatest in that size of nucleus. As you go to heavier nuclei like uranium for instance, the nucleus gets less stable. (see the related Wikipedia link) Larger atomic nuclei (up to lead) are stable because the repulsive electrostatic force does not decrease with distance as greatly as the strong nuclear force does.
