Why PbCl2 is more stable than SnCl2?

PbCl2 is more stable than SnCl2 primarily due to the larger size and higher charge density of the lead ion (Pb^2+) compared to the tin ion (Sn^2+). Lead's larger atomic radius allows for better lattice energy stabilization in its chloride form, as it can accommodate greater ionic interactions. Additionally, lead's lower electronegativity relative to tin makes it less prone to oxidation, contributing further to the stability of PbCl2.