Among the d-block elements, the highest melting point is shown by `"…..............."`

Answer

To determine which d-block element has the highest melting point, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the d-block Elements**: The d-block elements are transition metals found in groups 3 to 12 of the periodic table. They include elements from the 3d, 4d, and 5d series.

2. **Identify the Series**: The d-block elements can be categorized into three series based on their electron configurations:
- 3d series: Scandium (Sc) to Zinc (Zn)
- 4d series: Yttrium (Y) to Cadmium (Cd)
- 5d series: Hafnium (Hf) to Mercury (Hg)

3. **Melting Point Trends**: Generally, the melting points of transition metals increase across a period and decrease down a group. However, the 5d series tends to have higher melting points than the 4d and 3d series due to the presence of stronger metallic bonding.

4. **Examine the 5d Series**: The 5d series includes:
- Hafnium (Hf)
- Tantalum (Ta)
- Tungsten (W)
- Rhenium (Re)
- Osmium (Os)
- Iridium (Ir)
- Platinum (Pt)
- Gold (Au)
- Mercury (Hg)

5. **Identify the Element with the Highest Melting Point**: Among the 5d series, Tungsten (W) is known for having the highest melting point. Its melting point is approximately 3422 °C, which is higher than that of any other d-block element.

6. **Conclusion**: Therefore, the d-block element with the highest melting point is **Tungsten (W)**.

### Final Answer:
The highest melting point among the d-block elements is shown by **Tungsten (W)**.

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