Department of Pre-University Education, Karnataka course PUC Karnataka Science Class 12
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# The Mass Number of a Nucleus is - Physics

ConceptAtomic Masses and Composition of Nucleus

#### Question

The mass number of a nucleus is

• always less than its atomic number

• always more than its atomic number

• equal to its atomic number

• sometimes more than and sometimes equal to its atomic number.

#### Solution

sometimes more than and sometimes equal to its atomic number

Mass number of a nucleus is defined as the sum of the number of neutron and protons present in the nucleus, i.e. the number of nucleons in the nucleus, whereas atomic number is equal to the number of protons present. Therefore, the atomic number is smaller than the mass number. But in the nucleus (like that of hydrogen 1H​1), only protons are present. Due to this, the mass number is equal to the atomic number.

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#### APPEARS IN

HC Verma Solution for Concepts of Physics - Vol. 2 (2018 to Current)
Chapter 24: The Nucleus
MCQ | Q: 4 | Page no. 440

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Solution The Mass Number of a Nucleus is Concept: Atomic Masses and Composition of Nucleus.
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