Since Antiquity, humanity has sought to understand the fundamental nature of matter. From Aristotle's four elements to the scientific revolution of the 19th century, the concept of chemical elements has gradually refined. Mendeleev's work, with his periodic classification, marked a decisive step by revealing the hidden order that structures the properties of elements.
Today, each element is defined by the number of protons in its nucleus, determining its chemical properties and behavior in reactions. The study of electronic and nuclear structure allows us to understand reactivity, stability, and the types of bonds that elements can form. This atomic vision forms the foundation of all modern chemistry.
Chemical elements play an essential role in all scientific and industrial fields. Light elements, such as hydrogen or oxygen, are indispensable in biochemistry and energy technologies. Transition metals are involved in catalysis, electronics, or advanced materials. As for radioactive elements, they are used in medicine and nuclear energy production. Their diversity illustrates the central importance of chemical elements in technological and scientific progress.
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The Atom in All Its Forms: From Ancient Intuition to Quantum Mechanics 
