Question

Isotopes are identified by:

• A. positive ray analysis
• B. Astons' mass spectrograph
• C. Dempster's mass spectrograph
• D. all of the above

Answer 1

The correct option is D all of the above

Isotopes are identified by positive ray analysis, Astons' mass spectrograph and Dempster's mass spectrograph.
Isotopes are identified by their atomic mass, which is the total number of protons and neutrons contained in the isotope. Thus, different isotopes have a different number of nucleons.