Examlex
In most months, there are no eclipses.
Chemical Bonds
The attractive forces that hold atoms together in molecules or crystals, forming as a result of sharing or transferring electrons between atoms.
Molecule
The smallest particle of a chemical substance that can exist independently while retaining the chemical properties of the substance.
Atoms
The basic unit of a chemical element, consisting of a nucleus of protons and neutrons, and surrounded by electrons.
Ion
An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
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