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Question
Property(ies) of all the alkali metals that increase(s) with their atomic number is (are):
Property(ies) of all the alkali metals that increase(s) with their atomic number is (are):
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Solution
The correct options are
A solubility of their hydroxides
B thermal stability of their carbonates
D softness
The solubility of their hydroxides increases with their atomic number due to a decrease in lattice energy. Thermal stability of carbonates increases with increase in atomic number. As atomic number increases, charge density decreases and hence it causes less distortion to the negative ion. Softness increases with increasing atomic number as the size of the metal increases and the electrons are not compactly arranged. Moreover, the lattice energy also decreases, leading to increase in softness. Hydration energy depends on the size of the cation. Smaller the size, higher the hydration energy. Hence with increasing atomic number, hydration energy decreases.
A solubility of their hydroxides
B thermal stability of their carbonates
D softness
The solubility of their hydroxides increases with their atomic number due to a decrease in lattice energy. Thermal stability of carbonates increases with increase in atomic number. As atomic number increases, charge density decreases and hence it causes less distortion to the negative ion. Softness increases with increasing atomic number as the size of the metal increases and the electrons are not compactly arranged. Moreover, the lattice energy also decreases, leading to increase in softness. Hydration energy depends on the size of the cation. Smaller the size, higher the hydration energy. Hence with increasing atomic number, hydration energy decreases.
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