CHEM-C 117 Lecture Notes - Lecture 2: Visible Spectrum, Particle Beam, Molar Mass
Document Summary
C117 chapter 7 notes- the quantum-mechanical model of the atom. History of quantum mechanics: until early 1900s, believed all physical phenomena were deterministic- knowing current conditions enough to predict future ones. Positions of pla(cid:374)ets (cid:272)a(cid:374) (cid:271)e p(cid:396)edi(cid:272)ted f(cid:396)o(cid:373) p(cid:396)ese(cid:374)t positio(cid:374)s/(cid:448)elo(cid:272)ities (cid:271)y ne(cid:449)to(cid:374)"s. Laws of motion: work by famous physicists showed, for sub-atomic particles, present conditions do not fully determine future ones. Albert einstein, neils bohr, louis de broglie, max planck, werner heisenberg, p. a. m. Dirac, erwin schr dinger: quantum mechanics- new model that showed probabilistic description and provided correct explanation. Quantum-mechanical model explains manner in which electrons exist/behave in atoms: helps us understand and predict properties of atoms that are directly related to behavior of electrons: Why some elements are metals, others nonmetals. Why some elements gain different numbers of electrons when forming anions. Why elements vary so much in reactivity. Why properties of elements exhibit periodic patterns.
