Chp.18 Nucleus /Answers

Answer No.	Answers//Chap.18 Nucleus	Return
1	A nucleus is composed of protons and neutrons, collectively called nucleons.
2	Z is the atomic number (number of protons), and A is the mass number (total number of protons and neutrons).
3	They have the same charge number Z. isotopes of the carbone.
4	The radius r of the nucleus is: r = r₀A1/3
5	Because the mass of electrons is negligible compared to that of the nucleus.
6	Yes, it is approximately the same for all nuclei (~2.3 × 1017 kg/m³).
7	Δm = Z × mp + (A – Z) × mn – mnucleus
8	Because the mass of the nucleus is less than the sum of its components due to the binding energy (mass defect). Example : Look the figue
9	We use MeV (Mega electron-volt) instead of joules since it suits nuclear scales.
10	It is the energy required to completely separate all the nucleons in a nucleus.
11	It is the binding energy per nucleon: Eb / A. It reflects the nucleus’s stability.
12	The binding energy per nucleon. The higher it is, the more stable the nucleus.
13	y is the binding energy per nucleon (E/A), and x is the mass number A.
14	To compare nuclear stability and explain fusion and fission processes.
15	Around A ≈ 56 (iron), where the binding energy per nucleon is highest.