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Answer variants:
neutrons
gram molecular mass
same
protons
different
mass number
artificial transmutation
natural transmutation
standard atomic weight
atomic number
electrons
 
1. Atoms of different elements having
 mass number, but 
 atomic numbers are called isobars.
 
2. Atoms of different elements having same number of 
 are called isotones.
 
3. Atoms of one element can be transmuted into atoms of other element by
.
 
4. The sum of the numbers of protons and neutrons of an atom is called its
.
  
5. Relative atomic mass is otherwise known as
.