1.

What is an atom and molecule? What is the order of magnitude of mass of one atom? What are isotopes?

Answer»
  • The smallest indivisible particle of an element is called an atom. 
  • A molecule is an aggregate of two or more atoms of definite composition which are held together by chemical bonds. 
  • Every atom of an element has definite mass. The order of magnitude of mass of one atom is 10-27kg. 
  • Isotopes are the atoms of the same element having same atomic number but different mass number. 


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