Which of the following statement is correct?

Options

A. law of triads seemed to work only for large elements
B. john Newlands (law of octaves)arranged the elements in the increasing order of their atomic weights
C. Dobereiner arranged elements with the help of triads method
D. both (2)(3)

Answer

To determine which statement is correct, we will analyze each statement provided in the question step by step.

### Step 1: Analyze the First Statement
**Statement:** "Law of triads seem to work only for larger elements."

- The Law of Triads, proposed by Johann Wolfgang Döbereiner, states that when three elements are arranged in order of increasing atomic mass, the atomic mass of the middle element is approximately equal to the average of the atomic masses of the other two elements.
- This law was observed to work effectively for lighter elements, particularly up to calcium (atomic number 20). Therefore, the statement that it works only for larger elements is incorrect.

### Step 2: Analyze the Second Statement
**Statement:** "Newland's law of octaves arranged the elements in the increasing order of their atomic weights."

- John Newlands proposed the Law of Octaves, which states that when elements are arranged in order of increasing atomic weight, every eighth element has similar properties.
- This statement is correct, as Newlands did arrange the elements based on their atomic weights and observed the periodicity in their properties.

### Step 3: Analyze the Third Statement
**Statement:** "Döbereiner's arranged elements with the help of triads method."

- This statement is true. Döbereiner's triads were groups of three elements with similar properties, and he used this method to classify elements based on their atomic masses.
- Therefore, this statement is also correct.

### Step 4: Analyze the Fourth Statement
**Statement:** "Both 2 and 3 are correct."

- Since we have established that both the second and third statements are correct, this statement is also true.

### Conclusion
The correct answer is that both statements 2 and 3 are correct, which corresponds to option 4.

### Final Answer
**The correct statement is:** Option 4 - Both statements 2 and 3 are correct.

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