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Systems of quantum dots (QD) connected to leads exhibit periodic conductancepeaks as a function of gate voltage arising from the Coulomb blockade effect\cite{review1,review2,review3}. Much effort goes into minimizing the size ofQDs and reaching the scale of single molecules\cite{molecular1,molecular2,molecular3} which could serve as nanoelectroniccircuit components such as transistors. Connecting molecules or nanoparticlesto external leads cannot be achieved by the traditional methods used insemiconductor based QDs, hence, controlling the coupling to nanoparticle QDs isa major technical challenge.  Here we present a novel technique by which we can explore electric propertiesof a metallic nanoparticle while varying the coupling to leads. We find thatthe conductance through the nanoparticle is characterized by \emph{two} gatevoltage periods. The relative strength of the periods depends both on thedot-lead coupling and on the source-drain voltage. These surprising findingsmay be a general property of strongly coupled metallic nanoparticles.

Two gate-voltage periods in a metallic-nanoparticle based single-electron transistor