Bonding/Bond reactions

• Covalent bonding is when atoms are shared. Mostly in non-metals
• Ionic bonding is the attraction between oppositely charged ions. A metal and a non metal
• Metallic bonding is an attraction between positively charged ions and delocalised electrons
• group 6 and 7 always gain electrons resulting in formation of negative ions
• Group 2 metals always lose 2 electrons forming double positive ions (2+) e.g Mg2+
• Group 1 metals lose 1 electron forming a positive ion
• Bond breaking is endothermic
• bond making is exothermic