The first hint to crack the puzzle "Metal used in nuclear control rods, atomic no. 72" is:

It is a word which contains 7 letters

The second hint to crack the puzzle "Metal used in nuclear control rods, atomic no. 72" is:

It starts with letter h

The third hint to crack the puzzle "Metal used in nuclear control rods, atomic no. 72" is:

It ends with letter m

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The answer for the puzzle "Metal used in nuclear control rods, atomic no. 72" is: