Question

the second ionization energy of Cu and the second ionisation energy Cr are sufficiently high

Answer 1

Cu stands for Copper.

Cr stands for Chromium.

The Electronic configuration of Cu is 3d10 4s1

The Electronic configuration of Cr is 3d5 4s1

The second ionization energies of Cu and Cr are sufficiently high.

These are much higher than the first ionization energies of Cu and Cr.

The reason for such high ionization energy is that the 1st electron from their outermost shell has already been removed. Now both of them have attained a stable noble gas state. The noble gas state means an inert state. In such a state, an element does not take part in a reaction. A lot of energy is required to initialize any reaction in such state.

So it will require a lot of energy to remove another electron from their Outermost or Valence shell.

Answer 2

Answer:

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