Modern Physics 5 Question 24
27. The mass number of a nucleus is
$(1986,2 M)$
(a) always less than its atomic number.
(b) always more than its atomic number.
(c) sometimes equal to its atomic number.
(d) sometimes more than and sometimes equal to its atomic number.
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Answer:
Correct Answer: 27. 3
Solution:
- In case of ${ } _1 H^{1}$, mass number and atomic number are equal and in case of ${ } _1 H^{2}$, mass number is greater than its atomic number.
