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Halogens and chalcogens have highly nega...

Halogens and chalcogens have highly negative electron gain enthalpies. Why?

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• Group 16 (chalcogens) and Group 17 (halogens) are interested to add two or one electrons respectively to attain stable noble gas configuration.
• Because of this interest these elements have highly negative electron gain enthalpies.
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FULL MARKS-PERIODIC CLASSIFICATION OF ELEMENTS -Additional Questions(2 MARK QUESTIONS)
  1. Groups from 13 to 18 in the periodic table are called p-block elements...

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  2. Why noble gases do not show much of chemical reactivity?

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  3. Halogens and chalcogens have highly negative electron gain enthalpies....

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  4. What are d-block elements? Why are they called so?

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  5. Elements Zn, Cd and Hg with electronic configuration (n-1)d^(10) ns^(2...

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  6. Why Zn, Cd and Hg are considered as soft metals?

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  7. Why d- block elements are known as transition element ?

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  8. What are f-block elements? How many series are there? Why they are cal...

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  9. Give the general electronic configuration of lanthanides and actides?

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  10. What are lanthanides and actinides?

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  11. What are semi - metal ? Give example.

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  12. What are periodic properties ? Give example.

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  13. Define ionic radius.

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  14. Cationic radius is smaller than its corresponding neutral atom. Justif...

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  15. Anionic radius is higher than the corresponding neutral atom. Give rea...

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  16. What are isoelectronic ions ? Give examples.

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  17. Define lonization energy. Give its unit.

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  18. Ionization energy of beryllium is greater than the ionization energy o...

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  19. Ionization energy of nitrogen is greater than the ionization energy of...

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  20. Define electron gain enthalpy or electron affinity. Give its unit.

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