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In the periodic table, what is a horizontal row called?
A
A series
B
A family
C
A group
D
A period
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1
Understand that the periodic table is organized in two main directions: horizontally and vertically.
Recognize that the vertical columns in the periodic table are called 'groups' or 'families', which contain elements with similar chemical properties.
Know that the horizontal rows in the periodic table are called 'periods'. Each period represents elements with increasing atomic number from left to right.
Recall that a 'series' is not a standard term used to describe rows or columns in the periodic table.
Therefore, the correct term for a horizontal row in the periodic table is a 'period'.