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The qualities of eka-aluminium predicted by Mendeleev are the same as the properties of the element aluminium, which was discovered later.
- a)scandium
- b)germanium
- c)Gallium
- d)Aluminium
Correct answer is option 'C'. Can you explain this answer?
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The qualities of eka-aluminium predicted by Mendeleev are the same as ...
Eka-aluminium and gallium are the same elements because the properties of Eka-Aluminium are almost identical to the qualities of the gallium element. Eka-Aluminium is a chemical element that has nearly identical properties to the gallium element. The properties of the elements, such as their atomic mass, density, melting temperature, the formula of chloride, and the formula of oxide, are nearly identical to those anticipated by Mendeleev in his theory.
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The qualities of eka-aluminium predicted by Mendeleev are the same as ...
Dmitri Mendeleev, while creating his Periodic Table, left some gaps for elements that were not yet discovered. He predicted the properties of these elements based on the properties of surrounding elements. One of these predicted elements was eka-aluminium (meaning "one below aluminium" in Sanskrit).
Later, the element gallium (Ga) was discovered, and its properties closely matched the predictions Mendeleev made for eka-aluminium. For example:
Mendeleev predicted an atomic mass of ~68 for eka-aluminium; gallium’s atomic mass is 69.7.
Predicted density ~6.0 g/cm³; gallium has a density of 5.9 g/cm³.
Predicted it would form a trivalent oxide; gallium forms Ga₂O₃.
This match between prediction and discovery strongly supported the validity of Mendeleev's periodic table.
Therefore, the correct answer is Gallium (option C).
Later, the element gallium (Ga) was discovered, and its properties closely matched the predictions Mendeleev made for eka-aluminium. For example:
Mendeleev predicted an atomic mass of ~68 for eka-aluminium; gallium’s atomic mass is 69.7.
Predicted density ~6.0 g/cm³; gallium has a density of 5.9 g/cm³.
Predicted it would form a trivalent oxide; gallium forms Ga₂O₃.
This match between prediction and discovery strongly supported the validity of Mendeleev's periodic table.
Therefore, the correct answer is Gallium (option C).
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The qualities of eka-aluminium predicted by Mendeleev are the same as ...
Properties of Eka-aluminium (Gallium) predicted by Mendeleev:
- Atomic number: Mendeleev predicted that eka-aluminium would have an atomic number of 31, which matches the atomic number of Gallium.
- Chemical properties: Mendeleev predicted that eka-aluminium would exhibit similar chemical properties to aluminium, such as forming a +3 oxidation state and reacting with acids to liberate hydrogen gas.
- Physical properties: Mendeleev also predicted that eka-aluminium would have a low melting point and density, similar to aluminium.
Discovery of Gallium:
- In 1875, Gallium was discovered by the French chemist Paul-Émile Lecoq de Boisbaudran, fulfilling Mendeleev's prediction of the properties of eka-aluminium.
- Gallium shares many similarities with aluminium, including its chemical behavior and physical properties.
- Gallium has a lower melting point than aluminium and can be found in some aluminium ores.
Therefore, the properties of eka-aluminium predicted by Mendeleev align closely with the properties of Gallium, which was discovered later.
- Atomic number: Mendeleev predicted that eka-aluminium would have an atomic number of 31, which matches the atomic number of Gallium.
- Chemical properties: Mendeleev predicted that eka-aluminium would exhibit similar chemical properties to aluminium, such as forming a +3 oxidation state and reacting with acids to liberate hydrogen gas.
- Physical properties: Mendeleev also predicted that eka-aluminium would have a low melting point and density, similar to aluminium.
Discovery of Gallium:
- In 1875, Gallium was discovered by the French chemist Paul-Émile Lecoq de Boisbaudran, fulfilling Mendeleev's prediction of the properties of eka-aluminium.
- Gallium shares many similarities with aluminium, including its chemical behavior and physical properties.
- Gallium has a lower melting point than aluminium and can be found in some aluminium ores.
Therefore, the properties of eka-aluminium predicted by Mendeleev align closely with the properties of Gallium, which was discovered later.
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