Tiêu đề EDX Topic 5 bonding.pdf ✅

Topic 6 Bonding & Structure 1

3 Oxygen is an element in group 6; it has electronic configuration 2,6. To obtain full outershell electrons it gains 2 electron from another atom , and it forms a negatively charged ion (O-2) With a charge of -2 Valence Electrons: electrons in the outer shell of an atom. E.g. Sodium has one valence electrons & chlorine has 7 valence electrons. Valency: is the number of electrons lost or gained by an atom to become stable. E.g. Sodium loses 1 electron its valency is 1 & chlorine gains 1 its valency is 1. Important Ionic Bonding Ionic Bonding Metals react with non-metals to form an ionic compound. Metal atoms loses electrons and forms a positive ion. Non-metal atoms gain electrons & form a negative ion with name ending in -ide. Positive and negative ions attract each other, and are arranged in a lattice as they have opposite charges. The compound has no overall charge. Ionic Bond: strong electrostatic force between positive & negative ions Topic 6