CM-UY 1004 Lecture Notes - Lecture 5: Periodic Table, Structural Formula, Boron
Document Summary
Atoms, molecules and ions: history of the atom, democritus believed the material world was made up of tiny indivisible particles, dalton"s atomic theory 1807ish b. i. Law of constant composition based on in a given compound, the relative numbers and kinds of atoms are constant b. ii. Law of conservation of mass based on the total mass of materials present after a chemical reaction is the same as the total mass present before the reaction b. iii. Law of multiple proportions if two elements a and b combine to form more than one compound, the masses of b that can combine with a given mass of a are in the ratio of small whole numbers. b. iv. Each element is composed of extremely small particles b. v. all atoms of a given element are identical but different from the atoms of other elements b. vi. Elements cannot be changed into atoms of a different element by chemical reactions; atoms are neither created nor destroyed. b. vii.
