why can’t atoms join together to create a new atom?

Question: why can't atoms join together to create a new atom?
- Keywords:
  atom,
  create,
  join
Asked by 15madthr to Huma, Jack, Lucy, Miranda, Peter on 16 Nov 2016.
- Peter Boorman answered on 16 Nov 2016:
  
  They do! Only many atoms joined together are called a molecule, instead of an atom. This is because atoms are generally thought of as being (almost) fundamental building blocks for all things used in chemistry.
  
  Peter

Question: why can't atoms join together to create a new atom?