Question

vertical columns of elements (families) on the periodic table with similar properties
period
quadrants
row
groups

Explanation:

To solve this, we analyze each option:

• "period": Horizontal rows in the periodic table, not vertical columns. Eliminate.
• "quadrants": Used in coordinate geometry, not related to periodic table columns. Eliminate.
• "row": Horizontal arrangement, not vertical. Eliminate.
• "groups": Vertical columns (families) of elements with similar properties in the periodic table. This matches the description.

Answer:

D. groups