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A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
A part or aspect of something abstract, especially one that is essential or characteristic.
A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
A chemical bond that involves the sharing of electron pairs between atoms.
A chemical bond formed between two ions with opposite charges.
The basic unit of a chemical element.
A small dense spherical structure in the nucleus of a cell during interphase.
A thing that is composed of two or more separate elements; a mixture.
A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.