Chemistry 1301A/B Study Guide - Final Guide: Unified Atomic Mass Unit, Diatomic Molecule, Atomic Mass
31 Oct 2018
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Weighted average: an average made with some elements having more importance (uses percentages) Consist of three types of particles: protons (+), neutrons (neutral), and electrons (-) Protons are in the nucleus, electrons occupy space around the nucleus. Protons and neutrons make up the mass while electrons are 1/1836 their mass. Atomic number: the number of protons in an atom. Mass number: the total number of protons and neutrons. Atomic mass: mass of an atom, measured in the atomic mass unit or dalton (exactly 1/12 of. C(cid:895) a(cid:374)d is de(cid:374)oted (cid:271)(cid:455) (cid:862)u(cid:863) o(cid:396) (cid:862)da(cid:863) Isotopic abundance: the percent of each of the isotopes of an element. Average atomic mass can be found by multiplying all isotopic masses by their percentages and adding them together. Ions: atoms/groups of atoms that have gained or lost electrons: cation: a positive ion, anion: a negative ion, molecular/complex ion: ions or molecules. Compound: a molecule containing atoms of more than one element.
