A) Hydration energy: \[Li>Na>K>Rb\]
B) Ionization energy: \[Li>Na>K>Rb\]
C) Density: \[Li<Na<K<Rb\]
D) Atomic size: \[Li<Na<K<Rb\]
Correct Answer: C
Solution :
In general, density increases on moving downward in a group but density of potassium (K) is lesser than that of the sodium (Na). This is because of the abnormal increase in atomic size on moving from Na (86 pm) to K (227 pm). Thus, the correct order of density is \[Li<K<Na<Rb\]
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