What is common in isotopes of an element and what is different in them?

Similarities:

Isotopes of an element have the same number of protons in the nucleus, which determines the element’s atomic number. This means that isotopes of an element have the same chemical properties and will react with other elements in the same way.

Differences:

However, isotopes of an element can have different numbers of neutrons in the nucleus. This means that isotopes of an element can have different atomic masses. The different number of neutrons in the nucleus can affect the stability and properties of the isotope.