Advertisements
Advertisements
प्रश्न
Define the term ‘electron affinity’.
Advertisements
उत्तर
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.
संबंधित प्रश्न
Element X is a metal with a valency 2, Y is 3 non- metal with a valency 3.
1) Write an equation to show how Y from an ion.
2) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.
Arrange the elements of second period in increasing order of their electron affinity. Name the elements which do not follow the trend in this period.
Explain the following:
Halogens have a high electron affinity.
Arrange the elements of group 17 and group 1 according to the given conditions.
Increasing electron affinity
Which has higher E.A. fluorine or Neon?
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.
Fill in the blank
The nature of oxide Al2O3 is ____
On descending a group, ______ in ionisation potential as well as electron affinity ______ oxidising capacity.
Neon shows zero electron affinity due to ______.
The electron affinity of an element X is greater than that of element Y.
How is the electronegativity of X likely to compare with that of Y?
