NATS 1940 Lecture Notes - Lecture 1: Unified Atomic Mass Unit, Atomic Orbital, Atomic Number

• School: York University
• Department: Natural Science
• Course: NATS 1940
• Professor: Mark Vicari

Document Summary

All matter is made up of atoms: atoms consist of, a nucleus; contains, protons, +ve charge, (cid:373)ass = 1 ato(cid:373)i(cid:272) (cid:373)ass u(cid:374)it, a. (cid:373). u. (cid:894)(cid:862)dalto(cid:374)(cid:863)(cid:895, neutrons, no charge, 1 a. m. u, an electron cloud, electrons have, negligible mass (~0 a. m. u. ) Number of electrons is normally the same as the number of. = a type of atom with a specific number of protons in the nucleus; e. g. # protons. 3: 92 occur naturally on earth, 20 are found in the human body, 6 are abundant in living things: Carbon (c), hydrogen (h), oxygen (o), nitrogen (n), phosphorus (p), sulfur (s) = a type of atom with a specific number of protons and neutrons in its nucleus: chemical elements may be represented by more than one isotope, e. g. , isotopes of hydrogen: 2: atomic number = total number of protons. Same for all isotopes of a chemical element: mass number = total number of nucleons (protons + neutrons)