Physics · Composition and size of nucleus, atomic masses, mass-energy relation, mass defect
Assertion The average mass of one Mg atom is 24.305 amu, which is not equal to t
Assertion The average mass of one Mg atom is 24.305 amu, which is not equal to the actual mass of one Mg atom. Reason Three isotopes, \( ^{24} M g,^{25} M g \) and \( ^{26} M g \) of Mg can be found in nature.
- A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- C. Assertion is correct but Reason is incorrect
- D. Assertion is incorrect but Reason is correct
Step-by-step solution
The average atomic mass of magnesium (24.305 amu) is a weighted average of the masses of its isotopes (24Mg, 25Mg, 26Mg), which are present in nature. Since each isotope has a different actual mass, the average mass does not equal the mass of any single isotope. Thus, the reason correctly explains the assertion.
Related MCQs
- The missing particle in the reaction:…
- Statement A: Density of nucleus is independent of its mass number Statement B: Beryllium is used as a moderator in nuclear reactors…
- A nucleus with atomic number and neutron number N undergoes two decay processes. The result is a nucleus with atomic number Z-3 and neutron …
- Starting with a sample of pure of its decays into in 15 min. The corresponding half-life is…
- If there are nuclear particles in a nucleus of radius then the number of nuclear particles in radius will be…