Chemistry · Periodic Classification
Consider the following statements about the periodic table: A. Lanthanides belong to period 6. B. Group 18 elements possess full valence shells. C. All elements in a group have identical valency, including Noble gases. D. Period 1 contains only 2 elements. Which combination is correct?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1A and D only
- 2B and D only
- 3A, C, D only
- 4A, B, D only✓
Correct answer
A, B, D only
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