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Write the formulae of chlorides of Eka-S...

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

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`GeCl_4, GaCl_3`
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Eka-aluminium is

Eka-aluminium is

Write the chemical formulae of the main ores of iron and aluminium.

The correct formula of the oxide of Eka-aluminium element predicted by Mendeleev was:

Mendeleev's predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. Name the elements which have taken the place of these elements.

VK GLOBAL PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -SHORT ANSWER QUESTIONS-I
  1. State Periodic Law on which the Modern Periodic Table is based.

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  2. What do you understand by the term periodicity? Does the periodicity i...

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  3. What does each group in the Periodic Table signify?

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  4. Why do elements in any given group have similar properties?

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  5. Why do group 1 elements form unipositive ions?

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  6. Why are the elements of group 18 called zero valent?

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  7. Why group 17 elements form uninegative anions?

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  8. Would you place the two isotopes of chlorine, Cl-35 and Cl-37 in diffe...

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  9. How does the metallic character change along the period?

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  10. What is atomic radius? Why does atomic radius decrease across a period...

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  11. Why does the size of the atom increase down the group?

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  12. Can the following groups of elements be classified as Dobereiner's tri...

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  13. Write the formulae of chlorides of Eka-Silicon and Eka-aluminium, the ...

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  14. If an element X is placed in group 14, what will be the formula and th...

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  15. Arrangement the following elements in increasing order of their atomic...

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  16. Identify and name the metal out of the following elements whose electr...

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  17. Arrange the following elements in the increasing order of their metall...

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  18. Which group of elements could be placed in mendeleev's periodic table ...

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  19. (i) Why do we classify elements? (ii) In Mendeleev's Periodic Tabl...

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  20. Explain why sodium is more reactive than lithium.

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