Question

which is another name for groups of elements?○ actinides○ families○ halogens○ periods

Explanation:

• Actinides are a specific subset of elements in the periodic table, not a general term for groups.
• Halogens are a single specific group (Group 17) of elements, not a general name for all groups.
• Periods are the horizontal rows of the periodic table, distinct from the vertical groups.
• Families is the common alternative name for the vertical groups of elements in the periodic table, as elements in the same group share similar chemical properties.

Answer:

B. families