Question

which oxidation state of copper does have partially filled orbital in d subshell

Answer 1

Answer:
The oxidation state of an element is related to the number of electrons that an atom loses, gains, or appears to use when joining with another atom in compounds. It also determines the ability of an atom to oxidize (to lose electrons) or to reduce (to gain electrons) other atoms or species. Almost all of the transition metals have multiple potential oxidation states.
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Answer 2

Answer:

Copper has a partially filled orbital in d subshell with an oxidation state of +1.

Explanation:

Chromium and copper are somewhat of exceptions in the list of transition metals. Both these elements are found to be more stable with their S orbital donating an electron to the D orbital.

Hence both copper and chromium have $4 s^{1}$ instead of$4 s^{2}$ Both of these shells donate an electron to make the $3 d^{9}$convert into $3 d^{10}$ and convert into $3 d^{6}$ respectively. Hence they have a partially filed orbital in d subshell. Copper undergoes this with an oxidation stage of +1.