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Property of the alkaline earth metals th...

Property of the alkaline earth metals that increases with their atomic number

A

solubility of their hydroxides in water

B

solubility of their sulphates in water

C

ionisation energy

D

electronegativity

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To determine the property of alkaline earth metals that increases with their atomic number, we will analyze the given options step by step. ### Step 1: Understanding Alkaline Earth Metals Alkaline earth metals are found in Group 2 of the periodic table. They include Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), and Barium (Ba). As we move down the group, the atomic number increases. ### Step 2: Analyzing Each Property We will evaluate each property mentioned in the options to see which one increases with atomic number. #### Option A: Solubility of Hydroxides in Water - Hydroxides of alkaline earth metals are Be(OH)₂, Mg(OH)₂, Ca(OH)₂, Sr(OH)₂, and Ba(OH)₂. - The solubility of these hydroxides in water increases down the group. - **Conclusion**: This property increases with atomic number. #### Option B: Solubility of Sulfates in Water - Sulfates of alkaline earth metals are BeSO₄, MgSO₄, CaSO₄, SrSO₄, and BaSO₄. - The solubility of these sulfates decreases down the group. - **Conclusion**: This property does not increase with atomic number. #### Option C: Ionization Energy - Ionization energy refers to the energy required to remove an electron from an atom. - As we move down the group from Be to Ba, the ionization energy decreases. - **Conclusion**: This property does not increase with atomic number. #### Option D: Electronegativity - Electronegativity is the tendency of an atom to attract electrons. - As we move down the group, electronegativity decreases due to the increasing atomic size and shielding effect. - **Conclusion**: This property does not increase with atomic number. ### Final Conclusion The only property that increases with the atomic number among alkaline earth metals is the solubility of their hydroxides in water. ### Answer **The property of alkaline earth metals that increases with their atomic number is the solubility of their hydroxides in water.** ---
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