unit 3

Metallic bonding ocurrs betwee the atoms of metal elements.

The outer electrons are delocalised (free to move). This produces the electrostatic attraction between the postive metal ions (atoms have lost an electron and so have become postively charged) and the negative delocalised electrons.

Because of the delocalised electrons, metals can conduct electricity because it allows electrons to flow through it. As one electron moves inot the metal, another will jump off the metal and so the matal remains unchanged as it alway has the same amount of electrons 

metals and water-  most metals don't react with wtaer only some very reactive metals will react.

           reactive metal+water -> metal hydroxide+hydrogen

metals and acids- only metals above HYDROGEN in REACTIVITY SERIES will react with acid 

                              because acids contain high numbers of h+ ions. 

metal+acid -> salt+hydrogen

metals and oxygen- only veyr reactive metals wiht react with oxygen.

metal+oxygen -> metal oxide