The first hint to crack the puzzle "It's light, metallic and has the atomic number 3" is:

It is a word which contains 7 letters

The second hint to crack the puzzle "It's light, metallic and has the atomic number 3" is:

It starts with letter l

The third hint to crack the puzzle "It's light, metallic and has the atomic number 3" is:

It ends with letter m

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The answer for the puzzle "It's light, metallic and has the atomic number 3" is: