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Isotopes of elements having atomic number less than 20 and with a neutron to proton ratio of close to 1 are more likely to be stable.
What is an isotope?
Isotopes are two or more atom kinds that share the same atomic number (protons in the nucleus), placement in the periodic table, and chemical element but have distinct nucleon numbers (mass numbers) as a result of possessing a different quantities of neutrons in their nuclei. Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic weights and physical characteristics. The atomic number of an atom is the sum of the number of protons in the nucleus and the number of electrons in a neutral (non-ionized) atom. The mass number of an atom is determined by the quantity of nucleons—both protons and neutrons—in its nucleus, and it varies for each isotope of a given element.
Isotopes of elements having atomic number less than 20 and with a neutron to proton ratio of close to 1 are more likely to be stable.
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