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What is the significance of the terms-'i...

What is the significance of the terms-'isolated gaseous atom' and 'ground state' while defining the ionisation enthalpy and electron gain enthalpy?
Hint: Requirements for comparison purposes.

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Isolated gaseous atom means that the atom should be free from other atoms in the gasesous state. No energy should be required to separate it further from other atoms. Ground state means the lowest energy state possible for that atom. These terms are used for comparison purposes.
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MODERN PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -CONCEPTUAL QUESTIONS
  1. What is the name and symbol of the element with atomic number 112?

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  2. What is the name and symbol of the element with atomic number 112?

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  3. What is the significance of the terms-'isolated gaseous atom' and 'gro...

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  4. Energy of an electron in the ground state of the hydrogen atom is -2.1...

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  5. The electron gain enthalpies of halogens are as given below: F =- 33...

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  6. Magnesium loses electrons successively to form Mg^(+),Mg^(2+)andMg^(3+...

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  7. Out of Na and Mg which has higher second ionisation energy?

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  8. Which is the smallest among Na^(o+),Mg^(2+),Al^(3+), and why?

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  9. Arrange the following in the order of increasing ionization potential

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  10. The electronic configuration for the following neutral atoms are given...

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  11. How would you explain the fact that the first ionisation enthalpy of s...

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  12. Among the second period elements the actual ionisation enthalpies are ...

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  13. Identify the best choice in the list: (i) Largest ionic size :Mg^(2+...

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  14. Arrange the following in the decreasing negative electron gain enthalp...

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  15. Which of the following has highest ionization energy

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  16. Arrange the following in the increasing order of the size . Cl^(-),...

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  17. A student reported the radii of Al ^(3+), Mg^(2+), and F ^(-) as 136 p...

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  18. Among the elements Li, K,Ca, S and Kr , which one is expected to have ...

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  19. The IE(1) and IE(2) (kJ mol^(-1)) of three elements A, B and C are giv...

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  20. Among the elements, B, Al, C and Si, a) which element has the highes...

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