CHEM 1127Q Lecture 5: Chapter 2- Sections 2.3, 2.5
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Document Summary
Topics covered: 2. 3 atomic structure and symbolism, 2. 5 periodic table. Protons : positively charged; found in the nucleus. Electrons: negatively charged; located around the nucleus. Atomic mass is the mass of an atom in atomic mass units. This is 1/12 of the mass of one carbon atom. Atoms are identified by the number of protons and neutrons they. Atomic number (z) : number of protons. Mass number (a) : total number of protons and neutrons. It is also the number of electrons, since atoms are neutral. Nucleons : term referring to protons and neutrons collectively. A represents the mass number (protons + neutrons) Z represents the atomic number (# of protons) Atomic number also represents # of electrons , if the atom is uncharged as it is here. X represents the letter symbol for the element. Here is a table to enhance understanding. All these symbols have equal proton, electron, and neutrons.
