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Q: The existence of isotopes was first suggested in 1913 by the radiochemist .........
  • A. Frederick Soddy
  • B. Carl D. Anderson
  • C. Arnest rutherford
  • D. Joseph Priestley
Correct Answer: Option A - Frederick Soddy was the first radiochemist who proposed the existence of isotopes. Isotopes are the element having same atomic number but different mass number.
A. Frederick Soddy was the first radiochemist who proposed the existence of isotopes. Isotopes are the element having same atomic number but different mass number.

Explanations:

Frederick Soddy was the first radiochemist who proposed the existence of isotopes. Isotopes are the element having same atomic number but different mass number.