اختبار إلكتروني: Defining the Atom

The history of the atom is a journey from philosophical speculation to scientific evidence. Democritus first proposed atomos as indivisible particles, while Aristotle championed the four-elements theory. Centuries later, John Dalton formulated the first modern atomic theory, defining atoms as the fundamental building blocks of elements that cannot be created or destroyed. This worksheet tests knowledge on these foundational concepts of atomic structure and the scientists who shaped our understanding of matter.