Question

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

Explanation:

• Actinides are a specific group of elements (the actinoid series), not a general term for groups of elements.
• Families is the term used to refer to groups of elements in the periodic table. Elements in the same family have similar chemical properties.
• Halogens are a specific family (group 17) of elements, not a general term for groups.
• Periods are the horizontal rows in the periodic table, not groups of elements.

Answer:

B. families