CHEM 1A Lecture Notes - Lecture 3: Relative Atomic Mass, Unified Atomic Mass Unit, Natural Number

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12 Oct 2016
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CHEM 1A Full Course Notes
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CHEM 1A Full Course Notes
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Bulk of mass of atom comes from protons and neutrons. Elements and compounds: elements are only made of one kind of atom, compounds are made up of two or more atoms. Pure substances: ha(cid:448)e to retai(cid:374) ato(cid:373)i(cid:272) ratio; (cid:272)a(cid:374)"t ha(cid:448)e a (cid:448)aria(cid:271)le ratio (cid:271)t(cid:449)(cid:374). Elements: 1 atom= atomic element, molecule = package of atoms (molecular element) Diatomic molecules: molecular elements (package of atoms, 7 diatomics. H2, n2, o2, f2, cl2, br2, i2. Makes a t on periodic table. Symbolic representation: whole number next to element symbol = # of protons, atomic weight. Based off on isotopes we find on earth. Not a whole number on periodic table. 4822 48 = atomic weight; 22= number of protons; bottom number = protons; mass number atomic number. P = 13, n = 14, e = 13. Neutral atom: # of protons = # of electrons. Patterns: mendeleev = attributed to putting up the periodic table.

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