Therefore, Isotopes are chemically same but physically different.
- These are elements which have the same atomic number but different atomic mass.
- They have the same atomic number because the number of protons that are inside their nuclei remains the same.
- But, they have different atomic mass because the number of neutrons that are also inside their nuclei is different.
- As the number of protons inside nuclei remains same, therefore the overall charge of the elements also remains same as in isotopes: no of protons = no of electrons.
- Hence, as isotopes overall charge remains neutral, therefore their chemical properties will also remain identical.
Examples of isotopes are:
1) Isotopes of hydrogen
2) Isotopes of carbon
- These are elements which have same atomic mass but a different atomic number.
- Hence, as isobars have different atomic number, therefore, they have a different number of electrons, and their chemical properties are different.
- The light nuclei have unstable isobars.
- Heavy nuclei have stable isobars and these occur in pairs.
- If the number of protons of one isobar matches with that of another, then they are called as mirror-nuclides of each other
Therefore, Isobars are chemically different but physically same.
These are elements having the same number of neutrons.