Q. In $\ _{88}Ra^{226}$ nucleus, there are
A) 138 protons and 88 neutrons
B) 138 neutrons and 88 protons
C) 226 protons and 88 electrons
D) 226 neutrons and 138 electrons
Explanation
(b) $\ _{e}X^{A} = \ _{88}Ra^{226}$
Number of protons $= Z = 88$
Number of neutrons $= A - Z = 226 - 88 = 138$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.