Define the term atomicity. Give examples.


“The number of atoms present in a molecule is called its atomicity.”

The molecules may be:                                                              

  1. Monoatomic __ consisting of one atom like He, Ne, Ar, Kr, etc.
  2. Diatomic __ consisting of two atoms like H2, Cl2, HCl, etc.
  3. Triatomic __ consisting of three atoms like CO2, H2S, etc.

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