The atomic number of the element unnilennium is:

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Strategy:
 Follow the IUPAC systematic nomenclature for elements with . Each digit in the atomic number corresponds to a specific numerical root.

Step 1: Decode the name
Prefixes:
- un = 1
- nil = 0
- enn = 9
- ium = suffix

Step 2: Combine the digits
Joining the digits , , and  gives the atomic number  (Meitnerium).

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