Because the transition state is unstable, reactant molecules don't stay there long, but quickly proceed to the next step of the chemical reaction.
According to the context, the term may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms held together by the attractive forces known as chemical bonds. When speaking of polyatomic ions, the distinction between them and ions is frequently ignored in the fields of quantum physics, organic chemistry, and biochemistry.
As our understanding of molecular structure has grown, so has the definition of a molecule. Molecules are the smallest particles of pure chemical substances that nevertheless retain their composition and chemical properties, according to earlier definitions that were less accurate.
The incorruptible quintessence aether, a fifth element, was thought to be the essential component of the heavenly bodies.
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