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What is a columns in the periodic table?

Answer:
They indicate groups of elements which often (but not always) share common properties. (cf. http://en.wikipedia.org/wiki/Periodic_table#Groups)

One of the common characteristics in a group is that they share the same number of electrons on the outer shell.
First answer by ID1422008515. Last edit by ID1422008515. Question popularity: 2 [recommend question].

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