Nucleus of an atom whose mass number is 24 consists of

Options

A. 11 electrons ,11 protrons and 13 eutrons
B. 11 electrons 13 proton and 1 neutrons
C. 11 protons and 3 protons
D. 11 protons and 31 electrons

Explanation

To solve the problem of determining the composition of a nucleus with a mass number of 24, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Mass Number**: The mass number (A) of an atom is defined as the total number of protons (Z) and neutrons (N) in the nucleus. Therefore, we have the equation:
\[ A = Z + N \]
Given that \( A = 24 \), we can express this as:
\[ 24 = Z + N \]

2. **Analyzing the Options**: We will evaluate each option provided to see if the sum of protons and neutrons equals 24.

3. **Option 1**: 11 protons and 13 neutrons.
\[ Z + N = 11 + 13 = 24 \]
This option satisfies the equation.

4. **Option 2**: 13 protons and 1 neutron.
\[ Z + N = 13 + 1 = 14 \]
This does not satisfy the equation.

5. **Option 3**: 11 protons and 3 neutrons.
\[ Z + N = 11 + 3 = 14 \]
This also does not satisfy the equation.

6. **Option 4**: 11 protons and 31 electrons.
- Note: Electrons do not contribute to the mass number. Therefore, we only consider protons and neutrons.
\[ Z + N = 11 + 0 = 11 \]
This does not satisfy the equation either.

7. **Conclusion**: The only option that satisfies the equation \( Z + N = 24 \) is Option 1, which has 11 protons and 13 neutrons.

### Final Answer:
The nucleus of the atom with mass number 24 consists of 11 protons and 13 neutrons.

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