Review of What Is a Chemical Element? By Eric Scerri and Elena Ghibaudi, eds. Oxford: Oxford University Press, 2020.

Whereas philosophy of physics and philosophy of biology have for long been well-established academic sub-disciplines, philosophy of chemistry in its modern sense is of more recent origin. The field essentially originated in the late 1980s, not least through the pioneering works and organizational efforts of Eric Scerri. Since then philosophy of chemistry has flourished and attracted much attention not only from historians and philosophers of science but also from some practicing chemists. As indicated by its title, the present work edited by Scerri and Elena Ghibaudi focuses on the nature and meaning of a chemical element, obviously a concept at the very heart of the chemical sciences.

The Limits of Classical Extensional Mereology for the Formalization of Whole–Parts Relations in Quantum Chemical Systems

This paper examines whether classical extensional mereology is adequate for formalizing the whole–parts relation in quantum chemical systems. Although other philosophers have argued that classical extensional and summative mereology does not adequately formalize whole–parts relation within organic wholes and social wholes, such critiques often assume that summative mereology is appropriate for formalizing the whole–parts relation in inorganic wholes such as atoms and molecules. However, my discussion of atoms and molecules as they are conceptualized in quantum chemistry will establish that standard mereology cannot adequately fulfill this task, since the properties and behavior of such wholes are context-dependent and cannot simply be reduced to the summative properties of their parts. To the extent that philosophers of chemistry have called for the development of an alternative mereology for quantum chemical systems, this paper ends by proposing behavioral mereology as a promising step in that direction. According to behavioral mereology, considerations of what constitutes a part of a whole is dependent upon the observable behavior displayed by these entities. Thus, relationality and context-dependence are stipulated from the outset and this makes behavioral mereology particularly well-suited as a mereology of quantum chemical wholes. The question of which mereology is appropriate for formalizing the whole–parts relation in quantum chemical systems is relevant to contemporary philosophy of chemistry, since this issue is related to the more general questions of the reducibility of chemical wholes to their parts and of the reducibility of chemistry to physics, which have been of central importance within the philosophy of chemistry for several decades. More generally, this paper puts contemporary discussions of mereology within the philosophy of chemistry into a broader historical and philosophical context. In doing so, this paper also bridges the gap between formal mereology, conceived as a branch of formal ontology, and “applied” mereology, conceived as a branch of philosophy of science.

The Limits of Classical Extensional Mereology for the Formalization of > Whole-Parts Relations in Quantum Chemical Systems

This paper examines whether classical extensional mereology is adequate for formalizing the whole-parts relation in quantum chemical systems. Although other philosophers have argued that classical extensional and summative mereology does not adequately formalize whole-parts relation within organic wholes and social wholes, such critiques often assume that summative mereology is appropriate for formalizing the whole-parts relation in inorganic wholes such as atoms and molecules. However, my discussion of atoms and molecules as they are conceptualized in quantum chemistry will establish that standard mereology cannot adequately fulfill this task, since the properties and behavior of such wholes are context-dependent and cannot simply be reduced to the summative properties of their parts. To the extent that philosophers of chemistry have called for the development of an alternative mereology for quantum chemical systems, this paper ends by proposing behavioral mereology as a promising step in that direction. According to behavioral mereology, considerations of what constitutes a part of a whole is dependent upon the observable behavior displayed by these entities. Thus, relationality and context-dependence are stipulated from the outset and this makes behavioral mereology particularly well-suited as a mereology of quantum chemical wholes. The question of which mereology is appropriate for formalizing the whole-parts relation in quantum chemical systems is relevant to contemporary philosophy of chemistry, since this issue is related to the more general question of the reducibility of chemical wholes to their parts and of the reducibility of chemistry to physics, which have been of central importance within the philosophy of chemistry for several decades. More generally, this paper puts contemporary discussions of mereology within the philosophy of chemistry into a broader historical and philosophical context. In doing so, this paper also bridges the gap between formal mereology, conceived as a branch of formal ontology, and ‘applied’ mereology, conceived as a branch of philosophy of science.

Conclusion

The conclusion recapitulates the thesis that has been defended in the book, reiterating the relevance of Boyle’s chemical philosophy for current debates in the philosophy of chemistry. The concluding remarks proceed to articulate the way in which Boyle’s emergentist conception of chemical qualities anticipates many of the positions currently taken by philosophers of chemistry, particularly with regard to the emergence and supervenience of chemical properties, epistemic and explanatory reductionism, and the autonomy of chemical explanations and of chemistry as a scientific discipline.

Introduction

The Introduction explains how the author came to write on the topic of Robert Boyle’s chemical philosophy, specifically emphasizing the relevance of Boyle’s philosophical contributions, particularly as they anticipate current debates in the philosophy of chemistry regarding emergence, reductionism, and the autonomy of chemistry and of chemical explanations. The Introduction discusses the main thesis of the book and gives a short description of each chapter, explaining both the main topic addressed by each chapter, how the chapter addresses the topic, and how the topic ties in to the main thesis of the book.