atom

• La plus petite unité d'un élément chimique, composée d'un noyau entouré d'électrons, qui conserve les propriétés chimiques de l'élément.

The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons, that retains the chemical properties of the element.

1. Basic unit of matterB2formalscientific

   The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.

   Atome (unité fondamentale de la matière)

   • An atom is the building block of all matter.
   • Water molecules consist of two hydrogen atoms and one oxygen atom.
   • Scientists have split the atom to release nuclear energy.

2. Very small amountB2informal

   A tiny or insignificant quantity of something.

   Quantité infime

   • There isn't an atom of truth in his story.
   • She didn't have an atom of doubt about her decision.
   • He felt not an atom of sympathy for the criminal.

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