DEFINITION: Two atoms that contain the same number of protons but different numbers of neutrons are isotopes of the same element. For example Deuterium and Tritium are isotopes of Hydrogen. Carbon-12, Carbon-13 and Carbon-14 are isotopes of carbon.
DIFFERENCE: 1. Isotopes of the same element have different structure. Like Graphite, Diamond and Buckminster fullerene are isotopes of carbon but the difference is in their structure.
Fullerene is the network like structure similar to design in football. The figure below depicts the structure of fullerene.
In Diamond carbon is arranged in tetrahedral manner. The figure below depicts the structure of diamond.
In graphite carbon is layered structure so easy to break. The figure below depicts the structure of graphite.
2. The isotopes of the same element have different physical property but same chemical property.
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