4.3-4.4chemical formulas and molecular models and intro to lewis model

what is a chemical formula?

indicates the elements present in the compound and the relative number of atoms or ions of each

in what order to elements go in a chemical formula?

more metallic elements first, then followed by less metallic elements

what is an empirical formula?

lowest whole number ratio of compound, a relative number

what is a molecular formula?

actual number of atoms of each element in a molecule of a compound

what is an example of an empirical formula?

CH2O

what is an example of a molecular formula?

C6H12O6

what is a structural formula?

uses lines to represent covalent bonds and shows how atoms in a molecule are connected/bonded to each other--can also indicate a sense of the molecule's geometry

what does it mean for an element to be "stable?"

noble gases, they have full outer shells which means they have met the expectations of the octet rule (8 valence electrons in the outermost shell)

what does the lewis model represent?

valence electrons as dots to depict molecules