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1. What do you call the vertical columns in the periodic table? How about the
horizontal rows?​


Sagot :

Question 1: The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. Groups are labeled at the top of each column.  Elements in the periodic table are organized according to their properties.

Question 2: In the Mendeleev periodic table, the vertical columns are called groups and the horizontal rows are called periods.