Question

why is first ionization enthalpy of copper is higher than that of sodium​

Answer 1

Answer:

First ionization energy of Copper is higher than that of alkali metals while second and third energies are lower than those of alkali metals. Reason: ... Due to smaller size and due to poor shielding effect of 3d orbital, Cu has higher first ionization energy.

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Answer 2

The first ionization enthalpy of copper is higher than that of the sodium​

Explanation:

During the ionization process of any element , the electron from very last shell i.e. valence shell is pulled out , and the energy required to pull the electron out , is referred to as the ionization energy .

The amount of energy depends on the stability of the element ,

i.e. ,

If the element gets stabilized after the removal of the electron , the ionization energy required will be less ,

And ,

In case the the element gets destabilized after the removal of the electron , the ionization energy required will be more ,

Sodium has only one electron in its valence shell , and after the removal of the electron , it gets stabilized , hence , the ionization energy will be less .

But , in case of Copper , pulling out the last electrons ,. will make Copper destabilized .

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