Copper atom undergoes oxidation to form Cu 2+ ions. Which of the following statement is TRUE about Cu 2+ ?

Question

Copper atom undergoes oxidation to form Cu 2+  ions. Which of the following statement is  TRUE  about Cu 2+ ?

Answer

The second electron that is lost originated from the d subshell

Answer

Formation of Cu 2+  ions requires less ionisation energy that the formation of Cu +

Answer

The remaining electrons    are less shielded than those in copper atom

Answer

Its effective nuclear charge  is lower than neutral copper atoms

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