In the periodic table, what is the exact position of elements known as Lanthanides?

Correct Answer: Group 3, Period 6 (Atomic numbers 58-71)

Subject: chemistry

• Group 3, Period 6 (Atomic numbers 58-71)
• Group 3, Period 7 (Atomic numbers 90-103)
• Group 2, Period 6 (Atomic numbers 58-71)
• Group 13, Period 6 (Atomic numbers 57-71)

Explanation: • <b>Key Fact</b> Lanthanides are inner transition elements belonging to Period 6, Group 3. • <b>Supporting Detail</b> Their atomic numbers strictly range from 58 (Cerium) to 71 (Lutetium). • <b>Related Concept</b> Actinides (90 to 103) belong to Period 7, Group 3. • <b>Why wrong options are wrong</b> Period 7 refers to Actinides. Group 2 or 13 positions are incorrect. • <b>Exam Trick</b> Lanthanides start after Lanthanum (57), Actinides after Actinium (89). • <b>Additional Info</b> They are often called "rare earth elements".

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