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Experiment: Egg in salted water or in normal water.

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Electron shell is a grouping of electrons surrounding the nucleus of an atom;

The chemical properties of an atom are determined by the outermost electron shell.

Outermost (la más externa). Las propiedeades de un átomo vienen definidas por los

electrones de la capa más externa (la más alejada del Núcleo). (valence electron/

electrones de valencia).

Surrounding the nucleus (que rodean al núcleo)

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Two or more elements join together. That union is the bond.

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Propiedades químicas.

They suggest the way an element

is going to behave. For instance,

forming a bond, or attracting external electrons.

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The smallest component of an element

having the chemical properties of the element.

Consisting of a nucleus with neutrons and protons.

Also electrons which are bounded to the nucleus by

electrical attraction.