Metals
are

  • a
    group of elements in the form of complex substances with characteristic
    metallic properties, such as high thermal and electrical conductivity, negative
    temperature coefficient of resistance, high ductility and metallic luster
  • a
    medium consisting of negative atomic residues (cores) located at the nodes of
    the crystal lattice, surrounded by a cloud of free electrons - electron gas
  • a medium consisting of
    positive atomic residues (cores) located at the nodes of the crystal lattice,
    surrounded by a cloud of free electrons - electron gas
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