The n/p ratio of a nucleus is an indication of the * A. chemical reactivity of the element concerned B. stability of the nucleus C. radius of the nucleus D. fissionability of the nucleus
choose the correct answer.
16. Considering Pb-207, Pb-208, Pb-209, the energy required to remove a neutron is maximum for Pb-208; this is because *
A. it is the only naturally occurring isotope of lead
B. it has a magic number of protons and magic number of neutrons
C. it has an even number of neutrons
D. it has an even number of nucleons
17. P-30 in unstable because *
A. its neutron to proton ratio is 1
B. its Z is odd
C. it has an odd-odd nucleus
D. it is chemically reactive
18. The n/p ratio of a nucleus is an indication of the *
A. chemical reactivity of the element concerned
B. stability of the nucleus
C. radius of the nucleus
D. fissionability of the nucleus
19. Consider the following: (1.The greater the number of protons, the greater is the coloumbic instability of the nucleus) (2.The net nuclear force is proportional to the total number of nucleons.)(3. The greater the n/p ratio, the greater is the stability of the nucleus.) Then which of the following is correct? *
A. Statements I and 2 can account for the relative stability of the atomic nuclei.
B. Statement 3 alone can account for the relative stability of the atomic nuclei
C. All the statements are false.
D. All the three statements can account for the relative stability.
20. In a nuclear reaction, the total mass loss is 0.01 amu; then the energy released is, *
A. 931 MeV
B. 93.1 MeV
C. 93100 MeV
D. 931 000 MeV
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