What is isotope?
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If the nucleus of an element has the same number of protons but the different number of neutrons, it is called an isotope of that element.
If the elements are the same but have different mass numbers, they are called isotopes of each other.
In nature, the same element is found in different mass numbers, called isotopes.
Since the elements are the same, they have the same atomic number or proton number. For example, the hydrogen element is found in three different mass numbers. They are-
Protium (atomic mass = 1)
Deuterium (atomic mass = 2)
Titrium (atomic mass = 3)
Here their atomic number or proton number is the same.
Isotopes can be remembered by the last letter “p” – the number of protons is the same.