01:160:161 Lecture Notes - Lecture 12: Triple Bond, Double Bond, Noble Gas
Document Summary
Cat-ions (+ charged) and anions (- charged) attract one another to form ionic compounds. Solid state is composed of a lattice: specific arrangement of alternating cations and anions. Atoms share electrons to achieve octets and lower potential energy to form molecular compounds. Chemical formula: indicates the elements present in a compound and its relative number of atoms or ions for each. Gives relative number of each atom of each element in a compound. Many compounds can have the same empirical formula. Shows actual number of atoms between compounds with same empirical formula. Shows how different atoms in a molecule are connected. H2o o: each covalent bond made up of 2 electrons (each) o o. Chemical symbol for the element represents the nucleus and the core electron. Dots around the symbol represent valence electrons. For main group elements : number of dots = valence electrons = group number o.
