Given what we know about the bonding mechanisms in the PCl3 compound formed by the bonding of phosphorus and chlorine, we can confirm that phosphorus will donate an electron to chlorine, forming a covalent bond.
Therefore, we can confirm that the bonding activity between phosphorus and chlorine includes the formation of a covalent bond after phosphorus donates one electron to chlorine in order for the latter to complete its outer electron shell.
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