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The IUPAC systematic name of a certain element is Unununnium. To which group of the periodic table does this element belong? Give the group number n.

1. 11
2. 13
3. 15
4. 17

Correct answer: 11

Solution

Unununnium encodes atomic number 111 (un+un+un = 1+1+1). Element 111, Roentgenium, is in Group 11 of the periodic table (the coinage metal group).

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