[Answer] 9. This metal's earlier name was "wolfram", which explains its symbol, "W". It melts at about 3410 degrees Celsius, which is the highest melting point of all metals. It is commonly used as the filament of light-bulbs.

Step 1 : Introduction to the question "9. This metal's earlier name was "wolfram", which explains its symbol, "W". It melts at about 3410 degrees Celsius, which is the highest melting point of all metals. It is commonly used as the filament of light-bulbs."

...1. Radium 2. Tungsten 3. Uranium 4. Cobalt The word "Tungsten" means "heavy stone" in Swedish. "Wolfram" is its German name, hence the symbol.

Step 2 : Answer to the question "9. This metal's earlier name was "wolfram", which explains its symbol, "W". It melts at about 3410 degrees Celsius, which is the highest melting point of all metals. It is commonly used as the filament of light-bulbs."

Tungsten:

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