11. What sub-atomic particle/s must have the same number in an Isotope of the same

element?


A. electrons B. neutrons C. protons D. both A and B


12. Which of the following is the correct use of Boron-10 in the field of medicine? It is

used as _____________.

A. an energy source for pacemakers

B. an energy source for most smoke alarms

C. a radiation source for treating brain tumors

D. a nuclear reactor for electrical power generation


13. What sub-atomic particle/s must have a different number in an isotope of the same

element?

A. electrons B. neutrons C. protons D. all of the above​