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The metallic atoms have a very weak attraction towards their outer electrons. These are free to move between the ionic atom cores ( = the nuclei and the inner electrons forming cations) and behave like an electron gas. They ensure the cohesion of the whole metal:
The mobility of the outer electrons explains the observed properties of the metals:
The properties of metals: - good electrical conductivity - good thermic conductivity - good malleability (they may be deformed) - good ductility (they may be streched) - metallic luster