Assertion: According to Mendeleev periodic properties of elements are the function of their atomic numbers.
Reason: Atomic number is equal to number of neutrons.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false

Explanation

To analyze the given question, we will break down the assertion and reason step by step.

### Step 1: Evaluate the Assertion
- **Assertion**: "According to Mendeleev, periodic properties of elements are the function of their atomic numbers."
- Mendeleev arranged the elements based on their atomic masses, not atomic numbers. Therefore, this assertion is incorrect.

### Step 2: Evaluate the Reason
- **Reason**: "Atomic number is equal to the number of neutrons."
- The atomic number actually represents the number of protons in an atom. The number of neutrons can be calculated using the formula:
\[ \text{Number of Neutrons} = \text{Mass Number} - \text{Atomic Number} \]
- For example, in the case of oxygen (atomic number 8, mass number 16), the number of neutrons is \(16 - 8 = 8\). Thus, the reason is also incorrect.

### Step 3: Conclusion
- Since both the assertion and the reason are incorrect, the correct answer is that both statements are false.

### Final Answer
Both the assertion and the reason are incorrect.

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