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(a) How do the properties of eka-alumini...

(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 Mendeleen to the then undiscovered elements (i) Scandium (ii) gallium, and (iii) germanium?

A

eka-aluminium

B

eka-silicon

C

cka-gcrmanium

D

eka - zinc

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The correct Answer is:
A
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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?

Did Mendeleev predict the properties of scandium and gallium even when these elements were not discovered ?

Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of their atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties, He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. How do we classify these newly discovered elements (eka-aluminium and eka-silicon)?

Read the passage and answer the following questions. Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of the.ir atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties. He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. Mention the group and the period of these elements in the modern periodic table.

The atomic masses of three elements X,Y and Z having similar chemical properties are 7,23 and 39 respectively (a) Calculate the average atomic mass of elements X and Z (b) How does the averge atomic mass of elements X and Z compare with the atomic mass of element Y (c) Which law of classification of elements is illustrated by this example? (d) What could the elements X,Y and Z be? (e) Give another example of a set of elements which can be classified according to this law.

(a) How is the valency of an element determined if its electronic configuration is known? Determine the valency of an element of atomic no. 9 (b) Given below are some elements of the Modern Periodic Table. Atomic numbers of the elements are given in the parentheses: A(4), B(9), C(14), D(19), E(20) (i) With the help of the electronic configuration, find out which one of the above elements will have one electron in its outermost shell? (ii) Which rwo elements belong to the same group? Give reasons for your answer. (iii) Which one of the above elements belonging to the fourth period has bigger atomic radius and why?.

NARAYNA-CLASSIFICATION OF ELEMENTS AND PERIODICITY -EXERCISE - 1 (C.W)
  1. The alpha helix in a protein is classified as the

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  2. Which is incorrect statement in respect of Mendeleev's periodic table ...

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  3. (a) How do the properties of eka-aluminium element predicted by Mendel...

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  4. Consider the isoelectronic species, Na^(+),Mg^(2+),F^(-) and O^(2-). T...

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  5. Which one of the following is correct order of the size of iodine spec...

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  6. The atomic radii in case of inert gases is

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  7. Which of the following sequence of elements is arranged in the order o...

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  8. Which of the following sets contain only isoelectronic species?

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  9. The ionic species having largest size is

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  10. The first ionisation potential of Na,Mg,Al and Si are in the order

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  11. Arrange S, P and As in order of increasing ionisation energy.

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  12. The element with the highest first ionization potential is:

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  13. Which of the following represents the correct order of increasing firs...

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  14. The second electron gain enthalpies (in kJ mol^(-1)) of oxygen and sul...

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  15. The electronic configurations of four elements are given below. Arrang...

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  16. Which of the following processes involves absorption of energy?

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  17. Which of the following represents the correct order of increasing elec...

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  18. The order of electron gain enthalpy (magnitude) of O, S and Se is:

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  19. The outermost electronic configuration of the least reactive element i...

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  20. Which one of the following is incorrect ?

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