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Question

A nucleus 2411Na is β-radioactive. What are the numbers 24 and 11 called ?

A
24 - neutron number, 11 - atomic number
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B
24 - electron number, 11 - atomic number
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C
24 - mass number, 11 - atomic number
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D
11 - mass number, 24 - atomic number
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Solution

The correct option is C 24 - mass number, 11 - atomic number
Generally a nucleus is represented as AZX where A= mass number and Z= proton number or atomic number.
Here, mass number A=24 and atomic number, Z=11 and the neutron number, N=AZ=2411=13

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