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Question
Define the term ‘electron affinity’.
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Solution
Electron affinity is the energy released when an isolated gaseous atom acquires an electron to form an anion.
\[\ce{X (g) + e- -> \underset{(anion)}{X-(g)}+ E.A.}\]
X is any element taken in its gaseous state.
RELATED QUESTIONS
Draw an electron dot diagram to show the formation of each of the following compounds:
Magnesium Chloride
[H = 1, C = 6, Mg = 12, Cl = 17]
Give one word or phrase for the following:
The amount of energy released when an atom in the gaseous state accepts an electron to form an anion.
Electron affinity values generally _______ across the periods left to right and ______ down the group top to bottom.
Give reason:
Electron affinity of halogens is comparatively high ?
Arrange the following according to the instruction given in the bracket:
F, B, N, O (In the increasing order of electron affinity).
A, B, C are three elements in which B is an inert gas other than helium. With this information complete the following table.
| Element | Atomic number | No. of electrons in the valence shell | Group to which the element belongs |
| A | Z − 1 | - | - |
| B | Z | - | - |
| C | Z + 1 | - | - |
Also, explain the following:
- Electron affinity of element A is more than that of element C.
- lonization energy of element C is less than that of element A.
- Electron affinity of B is zero.
The following questions refer to the Periodic Table.
Which of the elements has the greatest electron affinity among the halogens?
The electron affinity of an element X is greater than that of element Y.
State whether X is likely to be placed to the left or to the right of Y in the periodic table.
Among period 2 elements A, B, C and D, the one which has highest electron affinity is ______.
