BASIC CONCEPTS OF CHEMISTRY

1. The mass of an atom compared to the mass of an atom of carbon-12 is called

 
 
 
 

2. On the carbon-12 scale, what is the relative atomic mass of hydrogen

 
 
 
 

3. Who first discovered the phenomenon of isotopes

 
 
 
 

4. How many isotopes does carbon have

 
 
 
 

5. What instrument is used to measure the exact masses of different isotopes

 
 
 
 

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