Acute medicines for migraine are medications taken when an attack occurs to treat the symptoms. Learn more Acute medicines for migraine are medications taken when an attack occurs to treat the symptoms.
In chemistry, a metal is an element that readily forms positive ions (cations) and has metallic bonds. Metals are sometimes described as a lattice of positive ions surrounded by a cloud of delocalized electrons. The metals are one of the three groups of elements as distinguished by their ionization and bonding properties, along with the metalloids and nonmetals. On the periodic table, a diagonal line drawn from boron (B) to polonium (Po) separates the metals from the nonmetals.
1 A metal is a lattice of positive metal 'ions' in a 'sea' of delocalised electrons. 2  Metallic bonding refers to the interaction between the delocalised electrons and the metal nuclei. 3  The physical properties of metals are the result of the delocalisation of the electrons involved in metallic bonding. The physical properties of solid metals are: 2  conduct heat. 3  conduct electricity. 4  generally high melting and boiling points. 5  strong. 6  malleable (can be hammered or pressed out of shape without breaking). 7  ductile (able to be drawn into a wire). 8  metallic lustre. 9  opaque (reflect light).