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The first ionisation energy of the Be i...

The first ionisation energy of the Be is greater than that of B but the second ionisation energy of Be is less than that of B. explain.

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CHHAYA PUBLICATION-CLASSIFICATION OF ELEMENTS & PERIODICITY IN PROPERTIES-SOLVED WBCHSE SCANNER
  1. Arrange the following elements according to their decreasing oxidising...

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  2. Arrange as per introduction: (i) Na(2)O,B(2)O(3),Al(2)O(3),MgO (increa...

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  3. The first ionisation energy of the Be is greater than that of B but t...

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  4. (i) Two atoms X and Y have electronic configuration [He]2s^(2)2p^(3) a...

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  5. (i) Electron affinity of Cl is greater than that of E explain. (ii) ...

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  6. metallic property of element-down the group in periodic table.

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  7. Arrange the following in increasing order of ionic radius: Na^(+), F^(...

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  8. (i) Why does nitrogen have a higher ionisation enthalpy than that of o...

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  9. What will be the order of Na, Mg, Al and Si in terms of first ionisati...

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  10. Arrange the following ions in order of increasing ionic radii: Na^(+),...

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  11. (i) Why is theh electron-gain enthalpy of oxygen is less than that of ...

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  12. (i) Why is the first ionisation enthalpy of helium maximum among all t...

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  13. Determine the position of an element in long form of periodic table if...

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  14. Mention the name and the position of two elements, one of which is mos...

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  15. (i) Which of the following two elements have diagonal relationship? Li...

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  16. Arrange the following ions in ascending order of radius: Na^(+),F^(-),...

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  17. Is the electronegativity of Sn^(2+) and Sn^(4+) equal or different?

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  18. (i) What is the oxidation state of TI in the compound TlI(3)? (ii) W...

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  19. (i) Which one is more stable between BC l(3) and TiCl(3) and why? (i...

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  20. Arrange the following elements in the increasing order of their first ...

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