Full Idea
'Is a particle and my coin is heads' and 'is a particle and my coin is tails' are perfectly well defined predicates and they pick out perfectly well defined (relational) properties of physical particles.
Gist of Idea
A particle and a coin heads-or-tails pick out to perfectly well-defined predicates and properties
Source
Jerry A. Fodor (Psychosemantics [1987], Ch.2)
Book Reference
Fodor,Jerry A.: 'Psychosemantics' [MIT 1993], p.33
A Reaction
(Somewhat paraphrased). This is a very nice offering for the case that all predicates are properties, and hence that 'properties' is an entirely conventional category. It strikes me as self-evident that Fodor is not picking out 'natural' properties.