Question

explain: (i) ionisation enthalpy (ii) valence electrons (iii) electron affinity

Answer 1

IONISATION ENTHALPY:
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The Energy required to remove an electron from a neutral isolated gaseous atom and convert it into a positively charged gaseous ion is called Ionisation Enthalpy.

In simple words the energy required to remove an electron from an atom is known as ionisation enthalpy.

VALENCE ELECTRONS:
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The electrons present in the outermost shell of an atom are known as valence electrons.
These are the electrons on which chemical properties of an element depends and those that take part in chemical reactions.

ELECTRON AFFINITY:
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The amount of energy released while converting a neutral isolated gaseous atom into a negatively charged ion by the addition of electron is called electron affinity.

In simple language, energy released when an atom gains an electron.

Ps. 
The unit of both ionisation enthalpy and electron affinity is electron volts per atoms(eV/atom).


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