Construct a Concept Map Elements 2 of 23 Constants Periodic
     Construct a Concept Map: Elements 2 of 23> Constants Periodic Table atomic number (number of protons) are composed of are represented by have a   atoms chemical symbols have an with little mass and a negative charge are electrons  elements with mass and a positive charge are with mass and no charge are  mass number (number of protons+ neutrons) with the same number of -protons, different number  of neutrons are neutrons protons subatomic particles  
  
  Solution
Q no 1:-
 Since we know that,
 Isotopes are the elements which have same atomic no but different atomic mass. We see that here only C has two isotopes given that are Carbon-12 and Carbon-13.
 Hence option (d) is correct. ie C12 and C13.
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