Match List-I with List-II
| List-I | List-II |
| Name of the Particle | Charge and mass |
| (A) Proton | (I) \( +2e;\ 4\,\mathrm{u} \) |
| (B) Neutron | (II) \( +e;\ 1\,\mathrm{u} \) |
| (C) Deuteron | (III) \( 0;\ 1\,\mathrm{u} \) |
| (D) \( \alpha \)-particle | (IV) \( +e;\ 2\,\mathrm{u} \) |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
Each particle's charge is \( +e \) for every proton it contains, and its mass is close to 1 u for every nucleon (proton or neutron).
(A) Proton — this matches (II) \( +e;\ 1\,\mathrm{u} \). A single proton carries charge \( +e \) and has mass about 1 u.
(B) Neutron — this matches (III) \( 0;\ 1\,\mathrm{u} \). The neutron is uncharged and its mass is about the same as the proton's.
(C) Deuteron — this matches (IV) \( +e;\ 2\,\mathrm{u} \). The deuteron is the nucleus of deuterium: one proton and one neutron.
(D) \( \alpha \)-particle — this matches (I) \( +2e;\ 4\,\mathrm{u} \). The alpha particle is a helium nucleus: two protons and two neutrons.