Divide the following redox reactions into oxidation and reduction half-reactions.

$2{\mathrm{Cu}}^{+}\to \mathrm{Cu}+{\mathrm{Cu}}^{2+}$

Potassium (at No. 19) and chlorine (at No. 17) react to form a compound. Explain on the basis of electronic concept:

oxidation

Potassium (at No. 19) and chlorine (at No. 17) react to form a compound. Explain on the basis of electronic concept:

reduction

Potassium (at No. 19) and chlorine (at No. 17) react to form a compound. Explain on the basis of electronic concept:

Oxidising agent

Potassium (at No. 19) and chlorine (at No. 17) react to form a compound. Explain on the basis of electronic concept:

Reducing agent