Chemistry
Electron affinity is the :
- Power of an atom to attract an electron to itself.
- Energy released when an electron is added to an isolated atom in the gaseous state.
- Energy absorbed when an electron is added to an isolated atom in the gaseous state.
- Energy required to remove an electron from an isolated gaseous atom.
Periodic Table
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Answer
Energy released when an electron is added to an isolated atom in the gaseous state.
Reason — The amount of energy released while converting a neutral gaseous isolated atom into a negatively charged gaseous ion (anion) by the addition of electron is called Electron Affinity (E.A.).
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Related Questions
Parts (i) to (iv) refer to changes in the properties of elements on moving from left to right across a period of the Periodic Table. For each property, choose the correct answer.
(i) The non-metallic character of the elements :
- decreases,
- increases,
- remains the same,
- depends on the period
(ii) The electronegativity :
- depends on the number of valence electrons,
- remains the same,
- decreases,
- increases
(iii) The ionization potential :
- goes up and down
- decreases
- increases
- remains the same
(iv) The atomic size :
- decreases,
- increases,
- remains the same,
- sometimes increases and sometimes decreases
In the periodic table while going down in the halogen group :
- reactivity will increase
- electronegativity will increase
- ionic radius will increase
- ionisation potential will increase
Which of these statements gives the correct picture regarding halogens and alkali metals with respect to an increase in the atomic number ?
- Reactivity decreases in alkali metals but increases in halogens.
- Reactivity increases in both.
- Reactivity decreases in both.
- Reactivity increases in alkali metals but decreases in halogens.
The correct order of increasing ionisation energy of Be, Mg, Ca, Sr is :
- Be, Mg, Ca, Sr
- Ca, Mg, Be, Sr
- Sr, Ca, Mg, Be
- Mg, Ca, Sr, Be