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An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers.
Atom
Definition
An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers.
Atom
Atom
An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers.

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Atom

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Atomic number
The atomic number or proton number of a chemical element is the number of protons found in the nucleus of every atom of that ...
Mass
Mass is both a property of a physical body and a measure of its resistance to acceleration when a net force is applied. An ob ...
Chemical element
In chemistry an element is a species of atom having the same number of protons in its atomic nuclei. For example, the atomic ...
Electron
The electron is a subatomic particle, symbol e⁻ or β⁻ , whose electric charge is negative one elementary charge. Electrons be ...
Atomic mass
The atomic mass is the mass of an atom. Although the SI unit of mass is kilogram, the atomic mass is often expressed in the n ...
Molecule
A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished ...
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