Question:
Property of the alkaline earth metals that increases with their atomic number is
Property of the alkaline earth metals that increases with their atomic number is
Updated On: Jul 5, 2022
- solubility of their hydroxides in water
- solubility of their sulphates in water
- ionisation energy
- electronegativity
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The Correct Option is A
Solution and Explanation
The solubility of an ionic compound depends on two factors :
(i) Lattice energy and (ii) hydration energy
In case of alkaline earth metal hydroxides, the lattice energy decreases as we move down the group. This decrease is more than the decrease in the hydration energy down the group. Hence, their solubility increases down the group
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Concepts Used:
Group 2 Elements
The group two or alkaline earth metals are s-block elements with two electrons in their s-orbital. They are alkaline earth metals. They are named so because of the alkaline nature of the hydroxides and oxides.
Alkaline earth metals are characterized by two s-electrons. This group of elements includes:
- Beryllium (Be)
- Magnesium (Mg)
- Calcium (Ca)
- Strontium (Sr)
- Barium (Ba)
- Radium (Ra)
Elements whose atoms have their s-subshell filled with their two valence electrons are called alkaline earth metals. Their general electronic configuration is [Noble gas] ns2. They occupy the second column of the periodic table and so-called as group two metals also.