Doesn't Belong VThese brain teasers rely on your ability to recognize groups of common attributes. For each of these puzzles you'll need to figure out why the words or letters are grouped as they are. Sometimes you will be asked to pick the odd-one-out or to place a new word into the correct group.
Which of the following words doesn't belong:
HELIUM, ARGON, CALCIUM, NEON, RADON
HintThink about the location of each in the periodic table of elements.
AnswerCALCIUM doesn't belong; it is an alkaline earth metal, while the others listed are noble gases.
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