“…experimental physics was particularly interested in the processes taking place inside the atom, and in this field the classical mechanics was failing conspicuously and completely. Perhaps its most spectacular failure was with the fundamental problem with the structure of the atom.”
Physics and Philosophy (1942)
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James Jeans 54
British mathematician and astronomer 1877–1946Related quotes
Introduction
Higher Mathematics for Chemical Students (1911)
Source: An Invitation to Quantum Field Theory (2012), Ch. 1 : Why Do We Need Quantum Field Theory After All?
Principles of Modern Chemistry (7th ed., 2012), Ch. 5 : Quantum Mechanics and Atomic Structure

As quoted in Physics from Wholeness : Dynamical Totality as a Conceptual Foundation for Physical Theories (2005) by Barbara Piechocinska.

Preface
Lectures on Quantum Mechanics (2012, 2nd ed. 2015)

Source: Lectures on Quantum Mechanics (2012, 2nd ed. 2015), Ch. 1: Historical Introduction

Life 3.0: Being Human in the Age of Artificial Intelligence (2017)

“Atomic physics, was the worst thing that happened in the 20th century.”
Gustav Metzger: 'Destroy, and you create', 2012