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Na, K, Fe, Cu, Ag, Sn, Sb, W, ?, ?, ?

Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.

 

Puzzle ID:#30583
Fun:*** (2.68)
Difficulty:*** (2.64)
Category:Series
Submitted By:shenqiangAcn****!!

 

 

 



What are the next three terms of this sequence?

Na, K, Fe, Cu, Ag, Sn, Sb, W, ?, ?, ?


Hint

What are the full names of these chemical elements?
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