Chemistry · Periodic Classification of Elements
Which pair of elements has the same valency but different atomic numbers?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Lithium (Z = 3) and Sodium (Z = 11)✓
- 2Carbon (Z = 6) and Oxygen (Z = 8)
- 3Beryllium (Z = 4) and Nitrogen (Z = 7)
- 4Nitrogen (Z = 7) and Neon (Z = 10)
Correct answer
Lithium (Z = 3) and Sodium (Z = 11)
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