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More ways to get Braingle...

Three the Hard Way



 

Puzzle ID:#11873
Fun:*** (2.21)
Difficulty:*** (2.82)
Category:Other
Submitted By:Codammanus***
Corrected By:norcekri

 

 

 



Using the Periodic Table, and the table alone, without any in-depth knowledge or insight, I challenge you to tell me the missing members of the unique group of elements below.

Group: As, Dy, Ir, Ra, Cs, Ti

Given:

1. The saying about felines would not be false if they had as many lives as this group has members.

2. Cs [Cesium, or Caesium] is in the middle of the group, when placed in order of what gives the members their membership. (Let's call these their "membership cards".)

3. There is ONLY ONE member in this group that is missing which, if their "membership card #" is squared, will give you a year in the 20th century in which the second digit is a perfect square, the third is the square root of that perfect square, and the last is a multiple of the square root of that perfect square.

4. "Those Extremely Smart go to the rear of the group, please".

What's missing from the group?




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