Home
Class 12
CHEMISTRY
Explain the variations in the following ...

Explain the variations in the following properties of group-18 elements :
(i) Atomic radii
(ii) Ionisation enthalpy
(iii) Electron gain enthalpy

Text Solution

Verified by Experts

(i) Atomic radii: The atomic radii of noble gases in their respective periods are exceptionally high because incase of noble gases, the atomic radii corresponds to Van-der-Waal.s radii which is always larger than covalent radii.
Down the group, the atomic radii increases with the increase in atomic number.
(ii) Ionisation enthalpy : Ionisation enthalpies of noble gases are exceptionally high due to presence of fully filled valence shells. However down the group the ionisation enthalpy decreases.
(iii) Electron gain enthalpy : The values of electron gain enthalpies are large positive as they have fully filled valance shells. Hence, they have no tendency to accept electrons and form anions
Promotional Banner

Topper's Solved these Questions

  • THE P-BLOCK ELEMENTS

    KUMAR PRAKASHAN|Exercise SELF- PRACTICE QUESTIONS (GIVE REASON FOR THE FOLLOWING)|6 Videos

  • THE P-BLOCK ELEMENTS

    KUMAR PRAKASHAN|Exercise SELF- PRACTICE QUESTIONS (GIVE SUITABLE EXPLANATIONS FOR THE FOLLOWING)|9 Videos

  • THE P-BLOCK ELEMENTS

    KUMAR PRAKASHAN|Exercise SECTION-A QUESTIONS (INTERHALOGEN COMPOUNDS)|2 Videos

  • THE D-AND F-BLOCK ELMENTS

    KUMAR PRAKASHAN|Exercise Section -E MCQs asked in GUJCET/Board Exams)|50 Videos

  • THE SOLID STATE

    KUMAR PRAKASHAN|Exercise SECTION - E (MULTIPLE CHOICE QUESTIONS)(MCQs ASKED IN BOARD EXAMS)|35 Videos