The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka – aluminium and eka-silicon. What names were given to these elements when they were discovered later on?

Academic Chemistry NCERT Class 10

Scandium, Gallium, Germanium are the three elements predicted by Mendeleev from the gaps in his periodic table and were known as eka-boron, eka – aluminium, and eka-silicon.

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Updated on: 10-Oct-2022

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Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev.
Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.(a) Name the element which has taken the place of (i) eka-aluminium, and (ii) eka-silicon (b) Mention the period/periods of these elements in the modern periodic table. (c) Write the group/ groups of these elements in the modern periodic table. (d) Classify these elements as metals, non-metals or metalloids. (e) How many valence electrons are present in the atoms of each of these elements?
The properties of eka-aluminium predicted by Mendeléev are the same as the properties of later discovered element: ScandiumGermaniumGalliumAluminium
In Mendeleev's Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the Periodic Table later?ChlorineSiliconOxygenGermanium
(a)How do the properties of eka – aluminium element predicted by Mendeleev compare with the actual properties of gallium element? Explain your answer.(b) What names were given by Mendeleev to the then undiscovered elements (i) scandium (ii) gallium, and (iii) germanium?
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his periodic table?
In Mendeleev’s periodic table, gaps were left for the elements to be discovered later. Which one of the following elements found a place in the periodic table later?GermaniumChlorineOxygenSilicon
Mendeleev ′ predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.(a) Name the elements which have taken the place of these elements(b) Mention the group and the period of these elements in the Modern Periodic Table.(c) Classify these elements as metals, non-metals or metalloids(d) How many valence electrons are present in each one of them?
What were the criteria used by Mendeleev in creating his Periodic Table?
(a) State Mendeleev’s periodic law.(b) What chemical properties of elements were used by Mendeleev in creating his periodic table? (c) State any three limitations of Mendeleev’s classification of elements. (d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table ? (e) Which group of elements was missing from Mendeleev’s original periodic table?
Name two elements whose properties were predicted on the basis of their positions in Mendeleev’s periodic table.
What physical and chemical properties of elements were used by Mendeleev in creating his periodic table? List two observations which posed a challenge to Mendeleev's Periodic Law.
What type of oxide would Eka-aluminium form?EO3E3O2E2O3EO
What is the usage of and elements? Why they were introduced?
Which great rulers were known as great strategists?

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