CHEM 1201 Lecture : Chem Notes 2.3-2.9
Document Summary
2. 3 - the modern view of atomic structure. Electronic charge : (1. 602 x 10^-19 c) charge of an electron is 1. 602 x 10^-19 c proton is equal in magnitude to that of an electron: +1. 602 x 10^-19 c. Every atom has an equal number of electrons and protons, so atoms have not net electrical charge. Protons and neutrons reside in the nucleus of the atom. Atom"s volume s the space in whish the electrons reside. Atom diameter: 1 x 10 ^-10m - 5 x 10^-10m (1-5a) Angstrom - non-si unit used for atomic dimensions; 1a = 1 x 10^-10m. Electrons are attached to the protons in nucleus by the electrostatic force that exists btwn particles od the opposite charge. Atomic mass unit (amu) : 1 amu = 1. 66054 x 10^-24 amu used to describe small mass of atoms the nucleus contains most of the mass of an atom. Electrons play the major role in chemical reactions.
