CHEM 1014 Lecture Notes - Lecture 3: Dmitri Mendeleev
Document Summary
All matter is composed of four elements and all matter is continuous, not atomistic. Atomos: the point at which matter can no longer be subdivided. Law of conservation of mass: during a chemical change, matter is neither created nor destroyed. A compound contains the same elements in certain definite proportions. Elements may combine in more than one set of proportions with each set corresponding to a different compound. All matter is composed of extremely small particles called atoms. All atoms of a given element are alike, and differ from the atoms of any other element. Compounds are formed when atoms of different elements combine in fixed proportions. Isotopes are atoms of the same element with different relative masses. 1869- dmitri mendeleev proposed arrangement of elements based on their chemical properties- periodic table. Alpha particles- big, heavy in the helium nucleus. The atom has a small dense nucleus which: The remainder of the atom- is mostly empty space.
