Give the formula and valency of cupric.

Hint: We know, co-valency is defined because the number of electrons present within the outermost shell which is shared by an atom during a compound. The atoms are inert if the atom has filled electron configuration. If the outermost shell isn't filled then to fill the outermost shell, it accepts or donates electrons between other atoms. The valency of an atom is the number of electrons present within the outermost shell. If the electrons are shared between covalent compounds then it's termed as co-valency.

Complete step by step answer:
We know that Copper is called cupric. The chemical Formula of copper is \[Cu\] and the atomic number of copper is $29$.
We can define valency as the combining capacity of an element. The Electron configuration of copper\[\left[ {Ar} \right]3{d^{10}}4{s^1}\]. Thus, the valency of cupric is $ + 2$.
We know, Oxidation is the process in which electrons of a molecule, atom or ion are lost during a reaction. Oxidation occurs when the oxidation state of the species is increased.
The substance which oxidizes other substances (by removal of hydrogen or addition of oxygen) and itself gets reduced (addition of hydrogen or removal of oxygen) is called oxidizing agent.
The give reaction is,
$CuO + {H_2}\xrightarrow{{}}Cu + {H_2}O$
In the above reaction, cupric oxide \[\left( {CuO} \right)\] acts as an oxidizing agent because it oxidizes hydrogen to form water and copper.

Note: We have to know that the copper (II) oxide or cupric oxide is the inorganic compound with the equation \[CuO\]. A dark strong, it is one of the two stable oxides of copper, the other being \[C{u_2}O\] or copper (I) oxide (cuprous oxide). As a mineral, it is known as tenorite. It is a result of copper mining and the antecedent to numerous other copper-containing items and synthetic mixes.