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How are atoms related to matter and chemical elements?
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atom
The Bohr model describes the structure of atoms, in this case hydrogen.
Atoms are the fundamental building blocks of all matter. They are composed of three primary subatomic particles: protons, neutrons, and electrons.12
The relationship between atoms, matter, and chemical elements is defined by the following principles:
- Atoms and Matter: Large groups of atoms, or molecules formed by atoms, constitute the bulk matter of everyday life. Matter is defined by its physical properties, such as mass and inertia, and exists in various states depending on temperature and conditions.13
- Atoms and Chemical Elements: A chemical element is a substance consisting of only one type of atom, all of which share the same atomic number. The atomic number, which corresponds to the number of protons in the nucleus, uniquely identifies an element.12
- Chemical Identity: While all atoms of a specific element have the same number of protons, they may have different numbers of neutrons, resulting in different isotopes. The number and arrangement of electrons, particularly in the outermost valence shell, determine how an atom interacts with others, forming the basis of chemical activity.412