Question

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What do you mean by ionisation enthalpy?

Answer 1

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Ionization Enthalpy of elements is the amount of energy that an isolated gaseous atom requires to lose an electron in its ground state. Losing of electrons results in the formation of cations. The first ionization energy of element A is the energy required by an atom to form A+ ions.

Answer 2

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HERE IS YOUR ANSWER....

$\bold\red{IONIZATION \:ENTHALPY}$ of elements refers to the total quantity of energy essential for an isolated gaseous atom to lose an electron in its ground state. ... The first ionization energy of an element (for example, element A) is defined as the energy required by an atom to form A+ ions