Advertisements
Advertisements
Question
Two nuclei have different mass numbers A1 and A2. Are these nuclei necessarily the isotopes of the same element? Explain.
Advertisements
Solution
No, Only when the two nuclei have the same atomic number then they are known as isotopes. Otherwise, they may be isobars also. Isobars have the same mass numbers.
RELATED QUESTIONS
The three stable isotopes of neon: `""_10^20"Ne"`, `""_10^21"Ne"` and `""_10^22"Ne"` have respective abundances of 90.51%, 0.27% and 9.22%. The atomic masses of the three isotopes are 19.99 u, 20.99 u and 21.99 u, respectively. Obtain the average atomic mass of neon.
Find the Q-value and the kinetic energy of the emitted α-particle in the α-decay of `""_88^226 "Ra"`.
Given `"m"(""_88^226"Ra")` = 226.02540 u, `"m"(""_86^222 "Rn")` = 222.01750 u,
`"m"(""_86^220 "Rn")`= 220.01137 u, `"m"(""_84^216 "Po")`= 216.00189 u.
Two nuclei have mass numbers in the ratio 1: 2. What is the ratio of their nuclear densities?
The mass number of a nucleus is
Nuclides with same neutron number N but different atomic number Z are called ______.
Are the nucleons fundamental particles, or do they consist of still smaller parts? One way to find out is to probe a nucleon just as Rutherford probed an atom. What should be the kinetic energy of an electron for it to be able to probe a nucleon? Assume the diameter of a nucleon to be approximately 10–15 m.
Distinguish between isotopes and isobars.
What is ‘Pair production’?
Assertion (R): Fusion of hydrogen nuclei into helium nuclei is the source of energy of all stars.
Reason (R): In fusion heavier nuclei split to form lighter nuclei.
Experiments on the scattering of alpha particles showed that the radius of a nucleus is smaller than the radius of an atom by a factor of about:
