Question

what is a vertical (up and down) column in the periodic table? options: periodic law, period, group or family, octet rule

Explanation:

To solve this, we analyze each option:

• "Periodic law" describes the repeating properties of elements, not a column.
• "Period" refers to horizontal (left - right) rows in the periodic table.
• "Group or family" is defined as the vertical (up - down) columns in the periodic table, where elements have similar chemical properties.
• "Octet rule" relates to electron configuration in bonding, not a column.

Answer:

C. group or family