The first attempt to classify elements was made by

Options

A. Mendeleev
B. Newlands
C. Lothar Meyer
D. Dobereiner.

Answer

To solve the question "The first attempt to classify elements was made by," we can follow these steps:

### Step 1: Identify the Key Figure
The first step is to identify the key figure in the history of chemistry who made significant contributions to the classification of elements.

**Hint:** Think about early chemists who attempted to organize elements based on their properties.

### Step 2: Recall the Contributions
Recall that this chemist introduced the concept of "triads," which are groups of three elements with similar properties.

**Hint:** Consider how elements can be grouped based on their physical and chemical properties.

### Step 3: Name the Chemist
The chemist who made the first attempt to classify elements using triads is Johann Wolfgang Döbereiner.

**Hint:** Look for the name associated with the triad concept in chemistry.

### Step 4: Explain the Triad Concept
Döbereiner observed that certain groups of three elements had properties that followed a trend. For example, if we take three elements A, B, and C, the properties of B (the middle element) would be approximately the average of the properties of A and C.

**Hint:** Think about how averages can represent a central tendency in a set of data.

### Step 5: Conclude the Answer
Therefore, the answer to the question is Johann Wolfgang Döbereiner.

**Hint:** Remember to summarize your findings clearly to provide a complete answer.

### Final Answer:
The first attempt to classify elements was made by Johann Wolfgang Döbereiner.