Q:
      
      
         
            
Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?
 
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: D) Element with 18 neutrons and 22 neutrons         
         
Explanation: Isobar: one of two or more atoms having equal atomic weights but different atomic numbers.
 
                    Mass number     Electrons      Neutrons
    Calcium            40                    20                 20
 
     Argon              40                    18                 22
       
      
      
      
          View Answer
          Report Error
          Discuss