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Ionic radii are...

Ionic radii are

A

Greater than the respective atomic radii of elements in general

B

Greater than the respective atomic radii of electropositive elements

C

Greater than the respective atomic radii of electronegative elements

D

Less than the respective atomic radii of electronegative elements

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The correct Answer is:
C
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Ionic radii vary in

The correct ionic radii order is

A : In NaCl coordination number of Cl^(-) ion is 6 but in CsCl coordination number of Cl^(-) ion is 8. R : Ionic radii changes with type of lattice.

The periodicity is related to the electronic configuration. That is, all chemical and physical properties are a manifestation of the electronic configuration of the elements. The atomic and ionic radii generally decrease in a period from left to right. As a consequence, the ionization enthalpies generally increase and electron gain enthalpies become more negative across a period. In other words, the ionization enthalpy of the exterme left element in a period is the least and teh electron gain enthalpy of the element on the exterme right is the highest negative. This results into high chemical reactivity at the two extermes and the lowest in he centre. Similarly down the group, the increase in atomic and ionic radii result in gradual decrease in ionization enthalpies and a regular decrease (with exception in some third period elements) in electron gain enthalpies in the case of main group elements. The loss and gain of electrons can be co-related with the reducting and oxidising behaviour, and also with metallic and non-metallic character respectively, of the elements. The correct order of the metallic character is:

The periodicity is related to the electronic configuration. That is, all chemical and physical properties are a manifestation of the electronic configuration of the elements. The atomic and ionic radii generally decrease in a period from left to right. As a consequence, the ionization enthalpies generally increase and electron gain enthalpies become more negative across a period. In other words, the ionization enthalpy of the exterme left element in a period is the least and teh electron gain enthalpy of the element on the exterme right is the highest negative. This results into high chemical reactivity at the two extermes and the lowest in he centre. Similarly down the group, the increase in atomic and ionic radii result in gradual decrease in ionization enthalpies and a regular decrease (with exception in some third period elements) in electron gain enthalpies in the case of main group elements. The loss and gain of electrons can be co-related with the reducting and oxidising behaviour, and also with metallic and non-metallic character respectively, of the elements. Which of the following statements is correct?

The periodicity is related to the electronic configuration. That is, all chemical and phyical properties are a manifestation of the electronic configurfation of the elements. The atomic and ionic radii generally decrease in a preiod from left or right. As a consequence , the ionisation enthalpies generally increase and electron gain enthalpies become more negative across a period. In other words, the ionisation enthalpy of the extreme left element in a period is the least and the electron left element on the extreme right is the highest negative. This results into high chemical reactivity at two extgremes and the lowest in the centre. Similarly down the group, the increase in atomic and ionic radii result in gradual decrease (with excetption in some third period elements) in electron gain enthalpies in the case of main group elements . These properties can be related with the (i) reducing and oxidising behacviour of the elements (ii) metallic and no-metallic charcter of element (iii) acidic, basic , amphoteric and neutral character of the oxides of the elements. Among Al_(2)O_(3), SiO_(2),P_(2)O_(3) and SO_(2) the correct order of acid strenght is :

The periodicity is related to the electronic configuration. That is, all chemical and physical properties are a manifestation of the electronic configuration of the elements. The atomic and ionic radii generally decrease in a period from left to right. As a consequence, the ionization enthalpies generally increase and electron gain enthalpies become more negative across a period. In other words, the ionization enthalpy of the exterme left element in a period is the least and teh electron gain enthalpy of the element on the exterme right is the highest negative. This results into high chemical reactivity at the two extermes and the lowest in he centre. Similarly down the group, the increase in atomic and ionic radii result in gradual decrease in ionization enthalpies and a regular decrease (with exception in some third period elements) in electron gain enthalpies in the case of main group elements. The loss and gain of electrons can be co-related with the reducting and oxidising behaviour, and also with metallic and non-metallic character respectively, of the elements. Considering the elements B, C, N, F and Si , the correct order of their non-metallic character is:

Ionic radii of

Correct order of Ionic radii :-

Ionic radii of :

AAKASH INSTITUTE ENGLISH-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-Assignment (Section -B)
  1. The element which has highest 2nd ionisation energy is

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  2. An atom with high electronegativity generally has :-

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  3. Ionic radii are

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  4. The first ionization enthalpies of Na,Mg,Al and Si are in the order

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  5. Which of the following has maximum number of unpaired electrons ?

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  6. Which of the following elements do not belong to the family indicated ...

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  7. If the atomic number of an element is 33, it will be placed in the per...

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  8. Which among the following elements has the highest value for third ion...

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  9. The screening effect of inner electrons of an atom can cause

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  10. The diagonal similarities are due to similar polarising powers for the...

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  11. Which of the following gradation in the properties is false, as we mov...

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  12. The increasing order of electron affinity values of O,S and Se is

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  13. The element which has highest II^(nd) I.E. ?

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  14. The element which has highest electron affinity ?

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  15. Electronegativity of an element is 1.0 on the Pauling scale. Its value...

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  16. Which of the following element has highest shielding constant ?

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  17. Which one of the following order is correct ?

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  18. Which one of the following oxides has highest acidic character ?

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  19. Electron gain enthalpy will be positive in

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  20. Enthalpy change in the following process is A+ e^(-) to A^(-) Delta H=...

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