Ontario Grade 9 Science Class Practice Exam

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What defines a period in the context of the periodic table?

A column of elements with similar properties
The total number of elements in the periodic table
A row on the periodic table
The time it takes for an element to react with another

The correct answer is: A row on the periodic table

The correct answer is option C, a row on the periodic table. This is because a period on the periodic table refers to a horizontal row of elements that share similar electron configurations and exhibit a periodic trend in chemical and physical properties. Option A, a column of elements with similar properties, is known as a group or family on the periodic table. Option B, the total number of elements on the periodic table, is not a defining feature of a period. Finally, option D, the time it takes for an element to react with another, is not relevant in determining a period in the context of the periodic table.