Which family on the periodic table includes elements with atomic numbers 57 through 71?

• A. Lanthanides
• B. Transition metals
• C. Actinides
• D. Noble gases

Answer: (A)

Verified step by step guidance

1. Identify the range of atomic numbers given: 57 through 71.
2. Recall that the periodic table is divided into blocks and families based on electron configurations and properties.
3. Recognize that elements with atomic numbers 57 through 71 belong to the f-block of the periodic table, specifically the lanthanide series.
4. Understand that lanthanides are a group of 15 metallic elements from lanthanum (57) to lutetium (71), known for their similar chemical properties.
5. Conclude that the family including elements with atomic numbers 57 through 71 is the Lanthanides.