1. Use the words in the box to complete the gaps below. Use each word only once. Missing words: bond, conductors, delocalised, electrons, ions, lattice, layers, lost, malleable, metal, outermost, positively, sea

When metal atoms together to form a solid metal the electrons in the
electron shell become free and move around. The electrons can move
throughout the whole structure. We say that these electrons have become
. As the metal atoms have electrons they become
charged metal . The positively charged metal ions are
attracted to the negatively charged . The metallic structure forms a
of ions surrounded by a of delocalised electrons. Due to
the metallic structure, metal ions arranged in can slide over each other
easily. This means that metals are both and ductile. Due to the freely
moving electrons metals are also very good of electricity and heat.