The total number of neutrons in dipositive zinc ions with mass number 65 is

Options

A. 32
B. 35
C. 40
D. 38

Explanation

To find the total number of neutrons in dipositive zinc ions with a mass number of 65, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Atomic Number of Zinc (Zn)**:
- The atomic number of zinc (Zn) is 30. This means that zinc has 30 protons.

2. **Understand the Mass Number**:
- The mass number is given as 65. The mass number is the total number of protons and neutrons in the nucleus of an atom.

3. **Calculate the Number of Neutrons**:
- The formula to calculate the number of neutrons is:
\[ \text{Number of Neutrons} = \text{Mass Number} - \text{Atomic Number} \]
- Substituting the values:
\[ \text{Number of Neutrons} = 65 - 30 = 35 \]

4. **Consider the Charge of the Ion**:
- The question specifies that we are dealing with a dipositive zinc ion (Zn²⁺). This means that the zinc atom has lost 2 electrons. However, the number of protons and neutrons remains unchanged in the nucleus. Therefore, the calculation for neutrons remains valid.

5. **Conclusion**:
- The total number of neutrons in the dipositive zinc ion with mass number 65 is 35.

### Final Answer:
The total number of neutrons in dipositive zinc ions with mass number 65 is **35**.

---