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Property of all the alkaline earth metals that increases with their atomic number is :
- a)solubility of their carbonates
- b)thermal stability of their sulphates
- c)ionisation energy
- d)electronegativity
Correct answer is option 'B'. Can you explain this answer?
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Property of all the alkaline earth metals that increases with their at...
In alkaline earth metals as the atomic number increases the number of atomic orbitals increases. In case of hydroxides, the lattice energies are different because of medium of size of hydroxide ions decreases on moving from BeBe to BaBa.This tend to increase the solubility and to overcome the counter-effect produced by decrease in hydration energy. Hence the solubility of alkaline earth metal hydroxides increases with increase in atomic number.
Whereas electronegativity, Solubility of their sulphates and IE decreases with increase in atomic number.
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Property of all the alkaline earth metals that increases with their at...
Thermal stability of their sulphates
The thermal stability of sulphates refers to the ability of a compound to resist decomposition when exposed to heat. In the case of alkaline earth metals, the thermal stability of their sulphates increases with their atomic number.
Explanation:
- Alkaline earth metals are a group of elements in the periodic table that includes beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
- The atomic number of an element is the number of protons in its nucleus. As we move from beryllium to radium, the atomic number increases.
- The thermal stability of sulphates is influenced by the charge density and size of the metal cation. The charge density is the charge per unit volume of the ion.
- As the atomic number increases in the alkaline earth metals, the charge density of the metal cation also increases. This is because the number of protons in the nucleus increases, while the number of electron shells remains the same.
- The higher charge density of the metal cation leads to stronger electrostatic attractions between the cation and the sulphate ion in the sulphate compound.
- This stronger attraction makes it more difficult for the sulphate compound to decompose when exposed to heat, resulting in higher thermal stability.
- Therefore, the thermal stability of sulphates increases with the atomic number of the alkaline earth metals.
Conclusion:
The property of alkaline earth metals that increases with their atomic number is the thermal stability of their sulphates. This is due to the increasing charge density of the metal cation as the atomic number increases.
The thermal stability of sulphates refers to the ability of a compound to resist decomposition when exposed to heat. In the case of alkaline earth metals, the thermal stability of their sulphates increases with their atomic number.
Explanation:
- Alkaline earth metals are a group of elements in the periodic table that includes beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
- The atomic number of an element is the number of protons in its nucleus. As we move from beryllium to radium, the atomic number increases.
- The thermal stability of sulphates is influenced by the charge density and size of the metal cation. The charge density is the charge per unit volume of the ion.
- As the atomic number increases in the alkaline earth metals, the charge density of the metal cation also increases. This is because the number of protons in the nucleus increases, while the number of electron shells remains the same.
- The higher charge density of the metal cation leads to stronger electrostatic attractions between the cation and the sulphate ion in the sulphate compound.
- This stronger attraction makes it more difficult for the sulphate compound to decompose when exposed to heat, resulting in higher thermal stability.
- Therefore, the thermal stability of sulphates increases with the atomic number of the alkaline earth metals.
Conclusion:
The property of alkaline earth metals that increases with their atomic number is the thermal stability of their sulphates. This is due to the increasing charge density of the metal cation as the atomic number increases.
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Property of all the alkaline earth metals that increases with their atomic number is :a)solubility of their carbonatesb)thermal stability of their sulphatesc)ionisation energyd)electronegativityCorrect answer is option 'B'. Can you explain this answer?
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