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Isotopes are different forms of the same element. They have the same number of protons and electrons, which means they have the same atomic number and chemical properties. However, isotopes differ in their number of neutrons and atomic mass.

Isotopes of a given element share several similarities: 1. Same atomic number: Isotopes of the same element have the same number of protons. This gives them the same atomic number and place in the periodic table. 2. Chemical properties: Since the number of electrons is the same for all isotopes of the same element, they exhibit similar chemical properties. This is because chemical properties are determined by the arrangement of electrons. 3. Electron configuration: Isotopes of the same element share the same electron configuration.

While isotopes share several similarities, they also have differences: 1. Atomic mass: The atomic mass of an isotope depends on the number of protons and neutrons in its nucleus. Since the number of neutrons can vary among isotopes, their atomic mass also differs. 2. Physical properties: Some physical properties, such as density and melting or boiling points, may differ slightly between isotopes due to their varying atomic masses. 3. Radioactivity: Some isotopes may be stable, meaning they don't undergo radioactive decay, while others may be unstable and undergo radioactive decay. Unstable isotopes are called radioisotopes and emit radiation as they decay. In summary, isotopes of a given element have the same atomic number, chemical properties, and electron configuration but differ in their atomic mass, some physical properties, and radioactivity.