Difference between H,2H and H2

H is one atom of hydrogen .
H2 is two atoms of hydrogen that is one molecule of hydrogen.
​2H is two molecules of hydrogen.
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Dear Arnav Rajesh , 
   H is a atom of hydrogen.
   H2 is two bonded atoms of hydrogen that forms a molecule of hydrogen.
  2H is two separate atoms of hydrogen.
  Hope this helps you!
K.R.Hari Krishna
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thank you guys
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