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For many years, the group 18(VIIIA) elem...

For many years, the group `18(VIIIA)` elements were called intert gases because no chemical reactiob were known for them. Now it is known that the heavier members do from compounds mostly with___________ .
(i) `F` (ii) `H`
(iii) `O` (iv) `C`

A

`(ii),(iii)`

B

`(iii),(iv)`

C

`(i),(iii)`

D

`(i),(ii)`

Text Solution

Verified by Experts

The correct Answer is:
C
`F` and `O` are the most electronegative elements.
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Answer question numbers 3(a) - 3(d) on the basis of your understanding of the following paragraph and the related studied concepts: Around the year 1800, only 30 elements were known. Dobereiner in 1817 and Newlands in 1866 tried to arrange the then known elements and framed laws which were rejected by the scientists. Even after the ejection of the proposed laws, many scientists continued to search for a pattern that correlated the properties of elements with their atomic masses. The main credit for classifying elements goes to Mendeleev for his most important contribution to the early development of a Periodic table of elements wherein he arranged the elements on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. The formula of their hydrides and oxides were treated as basic criteria for the classification of the elements. However, Mendeleev's classification also had some limitations as it could not assign the position to isotopes. He also left some gaps in the periodic table. 3(a) state Mendeleev's Periodic Law. 3(b) Why did Mendeleev leave some gaps in the Periodic table? 3(c) if the letter 'R' was used to represent any of the elements in the group , then the hydride and oxide of carbon would respectively be represented as (i) RH_4 , RO (ii) RH_4 , RO_2 (iii) RH_2 , RO_2 (iv) RH_2 , RO 3(d) isotopes are (i) atoms of an element with similar chemical properties but different atomic masses. (ii) atoms of different elements with similar chemical properties but different atomic masses. (iii) atoms of an element with different chemical properties but same atomic masses. (iv) atoms of different elements with different chemical properties but same atomic masses.

Which of the following were called permanent gases ? (i) H_(2) , (ii) O_(2) (iii) N_(2) , (iv) CH_(4)

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. How many valence electrons are present in each one of them?

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)?

R SHARMA-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN ELEMENTS-Follow-up Test
  1. The general valence shell electronic configuration of p-block elements...

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  2. How many elements belong to the p-block of the periodic table on the b...

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  3. For many years, the group 18(VIIIA) elements were called intert gases ...

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  4. p-block elements mostly fromcompounds.

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  5. Which of the groups of p-block contains the maximum number of metals?

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  6. Groups corresponding to the progressive filling of the ns and np orbit...

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  7. d-blcok elements are the elements in which the differentiating electro...

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  8. The general valence shell electronic configuration of transition eleme...

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  9. The transition metals are the elements in groups

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  10. Which of the d-block elements has zero electrons in the ns subshell?

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  11. f-block elements (sometimes called inner transition elements) are the ...

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  12. General valence shell electronic configuration of f-block elements is

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  13. In all there aref-block elements in the periodic table.

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  14. The lanthanoids and actinoids are sometimes called f-block transition ...

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  15. The chemistry of the early actinoids is more complicated than the corr...

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  16. In any atoms, the outermost electrons are those that have the highest ...

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  17. The elements Z = 117and 120 have not yet been discovered. In which fam...

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  18. Which of the following is the best criterion of a metal?

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  19. Which of the following is the best electrical consucting metals?

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  20. Which of the following is correct?

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