A. one proton only
B. one neutron only
C. one proton and one neutron
D. one proton, one electronic and one neutron
Correct Answer: Option A
A. one proton only
A. one proton only
B. one neutron only
C. one proton and one neutron
D. one proton, one electronic and one neutron
Correct Answer: Option A
A. one proton only
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