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When they contain an excess of neutrons
4 protons and 4 neutrons
Helium is the most stable element. All noble gases are "stable", but helium has the least amount of electrons, this causes it to be less affected by London dispersion forces (Vanderwal). This is why helium has the lowest boiling point of all elements.
ocean..
skeletal muscle cellsSkeletal Muscle Cells
70 protons, 98 neutrons
When they contain an excess of neutrons
10 protons, 12 neutrons
4 protons and 4 neutrons
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.
Gold
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(Explanation): remember that if an atom has less than 20 protons, the closer the number of neutrons and protons are, the more stable it is. Since 10 is closest to 12 out of these options, D is the correct answer.
Helium is the most stable element. All noble gases are "stable", but helium has the least amount of electrons, this causes it to be less affected by London dispersion forces (Vanderwal). This is why helium has the lowest boiling point of all elements.
ocean..
Stable temperatures and high rainfall amounts
In most atoms the protons and neutrons found in the nucleus are held together strongly. The nuclei of these atoms are said to be stable. However, the neutrons and protons in some atoms are not held together as strongly. These nuclei are unstable and will eventually disintegrate, forming other elements. Isotopes that are unstable are said to be radioactive and are called radioactive isotopes or radioisotopes.