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प्रश्न
How do the properties of eka-aluminium element predicted by Mendeleev compare with the actual properties of gallium element?
उत्तर
The properties of eka-alumiunium, predicted by Mendeleev, which was undiscovered then, were almost similar to the actual properties of the element discovered later on. The comparison table below shows the similarities in the properties of the undiscovered element then and the actual element (Gallium).
| Property | Eka-Aluminium | Gallium |
| Atomic Mass | 68 | 69.7 |
| Density | 5.9g/cm3 | 5.94g/cm3 |
| Melting point | low | 30.2oC (low) |
| Formula of oxide | Ea2O3 | Ga2O3 |
| Formula of chloride | EaCl3 | GaCl3 |
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संबंधित प्रश्न
An atom has electronic configurations 2, 8, 7.
What is the atomic number of this element?
The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminimum and eka-silicon. What names were given to these elements when they were discovered later on?
State the periodic law on which Mendeleev's periodic table table was based. Why and how was this periodic law changed?
What name were given by Mendeleev to the then undiscovered element scandium.
In Mendeleev's periodic table, why was there no mention of noble gases like helium, neon and argon?
Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table?
An element X forms an oxide X2O3. In which group of Mendeleev's periodic table is this element placed?
(a) group II
(b) group III
(c) group V
(d) group VIII
The elements from the zero group are called _______.
Two elements in the same position : demerit of Newland's octaves : : place for Isotopes : _______
Find the odd one out and give its explanation.
