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Chemistry is the science of atomic matter (that made of chemical elements), its properties, structure, composition and its changes during interactions and chemical reactions.
During chemical reactions, bonds between atoms break and form, resulting in different substances with different properties. In a blast furnace, iron oxide, a compound, reacts with carbon monoxide to form iron, one of the chemical elements, and carbon dioxide.
The Discoveries of Electrons, Protons and Neutrons
First Glance At Subatomic Particles
From Big Bang to Atoms
Introduction to Elements
Group 1 metals
Group 2 metals
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