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Explain why : The second ionisation en...

Explain why :
The second ionisation energy of Li is very high.

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The energy needed for Li_(g) rarr Li_(g)^(3+) + 3e is 1. 96 xx 10^4 kJ mol ^(-1) . If the first ionisation energy of Li is 520 k J mol^(-1) . Calcuate the second ionisation energy of Li . (Given : IE_1 for H = 2 . 2. 18 xx 10^(-18) k J "atom"^(-1) ).

With the help of Bohr 's model , calculate the second ionisation energy of helium (energy required to remove the electron from He^(o+)

Why is the second ionisation energy of an element much greater than its first ionisation energy ?

Second ionisation potential of Li,Be,B is in the order:

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The ionisation energy of Li^(2+) atom in ground state is,

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ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-TRUE OR FALSE TYPE QUESTIONS
  1. Justify the given statement with suitable examples -"the properties of...

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  2. Why do you think the noble gases are placed in a separate group?

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  3. All groups were subdivided into A and B sub groups in Mendeleev's peri...

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  4. Mendeleev's periodic table helped in correct determination of atomic m...

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  5. What is modern periodic law? Mention the important features of the lon...

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  6. What are transition elements ? How these differ from representative el...

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  7. Find out the Value ofequilibrium constant for the following reaction a...

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  8. In the fifth period 5s, 5p and 5d shells are filled.

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  9. Isotopes of an element are placed at the same place in the long form o...

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  10. The element with Z = 11 is present in the third period.

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  11. All lanthanides are supposed to be present in group 3 of the periodic ...

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  12. Atomic radius of F is greater than that of Ne.

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  13. Al^(3+) is smaller than Ca^(2+).

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  14. Explain why : The second ionisation energy of Li is very high.

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  15. np electrons are more penetrating than ns electrons.

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  16. The electron affinity of nitrogen is zero.

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  17. The electron affinity increases in going down a group.

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  18. Melting and boiling points increase regularly in going across the seco...

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  19. Melting point of LiCI is less than that of NaCl.

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  20. CsOH is more basic than Ba(OH)(2).

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