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Electronic configuration (1s, 2s, 2p, 3s, 3p) of an atom in the ground state and position in the periodic table (s and p blocks). Valence electrons. Chemical families. Noble gases and associated electronic configurations. Monatomic ions. Molecules. Lewis model of the valence bond, Lewis diagram, bonding and non-bonding pairs. Approach to binding energy. 00:00: What is a chemical family? 01:28: What is the electronic configuration of an atom? 04:35: What are valence electrons? 07:10: How do some atoms form ions? 09:47: What is the Lewis diagram of an atom? 12:25: How do some atoms form molecules?