Write the definitions of isotopes, isobar and isotone. 

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Write the unit of mass and its definition.

A nucleus of mass number $189$ splits into two nuclei having mass number $125$ and $64$ . The ratio of radius of two daughter nuclei respectively is:

  • [NEET 2022]

The particles which can be added to the nucleus of an atom without changing its chemical properties are called

The increasing order of atomic radii of the following Group $13$ elements is

  • [IIT 2016]

As compared $^{12}C$ atom, $^{14}C$ atom has