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Why is the atomic radius of gallium smal...

Why is the atomic radius of gallium smaller than that of aluminium?

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Assertion : Atomic radius of gallium is higher than that of aluminium Reason : The presence of additional d-electron offer poor screening effect for the outer electrons from increased nuclear charge.

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Assertion: The first ionisation energy of aluminium is lower than that of magnesium. Reason: The ionic radius of aluminium is smaller than that of magnesium.

Assertion: The first ionisation enthalpy of aluminium is lower than that of magnesium. Reason : Ionic radius of aluminium is smaller than that of magnesium.

In group 1 the atomic radius of sodium is greater than the atomic radius of lithium. Give reason.

In halogens (group 17) the atomic radius of chlorine is greater than the atomic radius of fluorine. Give reason.

The atomic size of beryllium is smaller than the atomic size of lithium. Give reason.

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ICSE-SOME P-BLOCK ELEMENTS -SHORT ANSWER TYPE QUESTIONS
  1. What is dry ice and why is it called so ?

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  2. Write the names and electronic configuration of all the elements belon...

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  3. Why is the atomic radius of gallium smaller than that of aluminium?

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  4. How do the Density property vary on moving down the group 13?

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  5. How do the Melting and boiling points property vary on moving down the...

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  6. How do the Metallic character property vary on moving down the group 1...

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  7. Why are the second and third ionisation energies of group 13 elements ...

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  8. What is inert-pair effect? Illustrate with an example.

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  9. Why does the stability of + 3 oxidation state decrease on moving down ...

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  10. Atomic size increases down a group of the periodic table. Explain.

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  11. Why does gallium have higher ionisation energy than aluminium?

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  12. Boron does not form ionic compounds containing B^(2+) ions. Comment on...

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  13. In the structure of diborane,

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  14. Why do boron halides act as Lewis acids ?

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  15. Arrange BF3, BCl3, B Br3, BI3 in the decreasing order of Lewis acid ch...

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  16. Why is boron trifluoride a weaker Lewis acid as compared to B Br3 and ...

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  17. Discuss the structure of aluminium chloride.

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  18. Inspite of being electron deficient, boron halides do not exist as dim...

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  19. What type of oxides are formed by group 13 elements and how does their...

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  20. Why does boron differ from other elements of its own group in several ...

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