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The electron gain enthalpies of halogens...

The electron gain enthalpies of halogens are as given below:
`F =- 332, CI =- 349, Br =- 324, I =- 295 kJ mol^(-1)`. The less negative value for F as compared to that of CI is due to:

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This statement is wrong because the actual order is :
`Cl gt F gt Br gt I`
In general, electron gain enthalpy becomes less negative down the group but F has abnormally less negative electron gain enthalpy than Cl because of its small size.
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The amount of energy released when an electron is added to an isolated gaseous atom to produce a monovalent anion is called electron affinity of first electron affinity or electron gain enthalpy. The first electron affinity is given a negative sign as the addition of an electron to a neutral atom is an exoergic process. The addition of electron to A^(-) requires energy to overcome the force of repulsion. Thus, the second electron affinity is an endoergic process. The magnitude of electron affinity depends on a number of factors such as (i) atomic size (ii) effective nuclear charge (iii) screening effects (iv) half and fully filled orbitals and (v) shape of orbital. In general, electron affinity increase as the atomic radii decrease in a period. However, there are exceptions when the atoms have stable configuration. In a group, electron affinity decreases as the size increases. However, the members of 3rd period have somewhat higher values than the members in the 2nd period of the same subgroups. The electron affinities of halogens are: F =- 332, CI =- 349, Br =- 324,I =- 295 kJ mol^(-1) The higher value of CI as compared to that of F^(-) is due to:

The electron affinities of halogens are F=322, Cl=349,Be=324,I=295kJ mol^(-1) . The higher value for Cl as compared to that of F is due to

Few values of enthalpies are given below: O=-141 KJ mol^(-1) F= -328 KJ mol^(-1) S= -200 KJ mol^(-1) Cl= -349 KJ mol^(-1) What do these values show?

The electron gain enthalpy values (in kJ mol^(-1) ) of three halogens, X, Y and Z are respectively -349, -333 and -325. Then X, Y and Z are respectively

Correct order of electron gain enthalpy (Kj/mole) of F, Cl, Br, I

MODERN PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -CONCEPTUAL QUESTIONS
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  2. Energy of an electron in the ground state of the hydrogen atom is -2.1...

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

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

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

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

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

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

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

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

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

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

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  13. Which of the following has highest ionization energy

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

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

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

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

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

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  19. Which of the following species has the smallest size? (a) K^(o+), Sr...

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  20. The first (IE1) and second (IE2) ionisation enthalpies ("kJ mol"^(-1))...

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