Cristall iònic

Cristall de la sal comuna (NaCl)

Un cristall iònic és un tipus de compost iònic en forma d'agregat estable[1] en què un conjunt d'ions (cations i anions) ordenats perfectament en l'espai formen aquest cristall, és a dir, un catió (signe +) estarà rodejat de signes - (anions). Un exemple de cristall iònic pot ser NaCl (la sal comuna).

Característiques físiques

  • Punt de fusió alt
  • Fràgils si no estan sota pressió
  • Dúctils sota pressió
  • Poden presentar conductivitat elèctrica
  • Òpticament transparents
  • Quan es dissolen en dissolvents polars, obtenim dissolucions conductores de l'electricitat per part dels anions i cations.

Referències

  1. Diversos autors. Física i química 1 Batxillerat. Nau Llibres, 2011, p. 58. ISBN 8476428251. 

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