Define Ionisation enthalphy. How does it vary along the period and dow

1.	Define Ionisation enthalphy. How does it vary along the period and down the group in the periodic table.
Answer» The minimum amount of energy is needed to remove the most loosely bounded electron from a neutral isolated gaseous atom in its ground state to form a cation also in a gaseous state. The ionization enthalpy decreases down the group because the atomic size increases down the group and effective nuclear charge decreases. Hence removal of electrons becomes easier. Ionisation energy increases along the period because the atomic size decreases from left to right in a period. Hence effective nuclear charge increases and removal of electrons becomes more and more difficult.

Define Ionisation enthalphy. How does it vary along the period and down the group in the periodic table.

Answer»

The minimum amount of energy is needed to remove the most loosely bounded electron from a neutral isolated gaseous atom in its ground state to form a cation also in a gaseous state.

The ionization enthalpy decreases down the group because the atomic size increases down the group and effective nuclear charge decreases. Hence removal of electrons becomes easier.

Ionisation energy increases along the period because the atomic size decreases from left to right in a period. Hence effective nuclear charge increases and removal of electrons becomes more and more difficult.

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