70 protons, 98 neutrons
10 protons, 12 neutrons
2 protons, 2 neutrons
calcium-20
70 protons, 98 neutrons
1 proton, 3 neutrons
A smaller nucleus is generally more stable. Below are some general rules: # (Except for really small nuclei) All stable nuclei contain a number of neutrons that is equal to or greater than the number of protons. # Nuclei with too few or too many neutrons is unstable. # If a nuclei has even numbers of nucleons, it's generally more stable. # Nuclei with "magic numbers" usually tend to be more stable.
More neutrons than protons.
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.
70 protons, 98 neutrons
When they contain an excess of neutrons
70 protons, 98 neutrons
1 proton, 3 neutrons
1 proton, 3 neutrons
Radioactive isotopes are not stable.
To become stable
4 protons and 4 neutrons
Of course they are more stable, therefore they formed naturally.
even
radioactive
even