Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev.

Academic Chemistry NCERT Class 10

The formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev.

Chlorides of Eka-silicon: ECl₄
Chlorides of Eka-Aluminium: ECL₃

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Updated on: 10-Oct-2022

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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?
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
(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?
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 type of oxide would Eka-aluminium form?EO3E3O2E2O3EO
Give the formulae of the chlorides of the elements X and Y having atomic numbers of 3 and 6 respectively. Will the properties of the two chlorides be similar or different? Explain your answer.
What are the chemical formulae of aluminium oxide and zinc acetate?
Write down the formulae of(i) Sodium oxide(ii) Aluminium chloride(iii) Sodium sulfide(iv) Magnesium hydroxide.
At the time of Mendeleev, the number of elements known was63656264
Write the structural formulae of all the isomers of hexane.
Write the formulae of: (a) methanoic acid, and (b) ethanoic acid.
What is meant by a chemical formula? Write the formulae of one element and one compound.
(a) What is meant by catenation? Name two elements which exhibit the property of catenation.(b) Write the names and structural formulae of all the possible isomers of hexane.
Write molecular, electronic and structural formulae of ethene.

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