CHEM 105-1 - 1 How badly a given atom “wants” electrons...

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Atomic Bookkeeping: 1.  Parts of the atom a. Proton (positive charge): P+; mass=1 amu b. Neutron (neutral charge)N; mass-1 amu c. Electron (negative charge)e-; mass=negligible 2. Relationships between atomic parts and the periodic table a. Atomic number=the number of P+=the number of e- b. Atomic charge=number of P+-number of e- c. Atomic mass=number of P++number of N 3. Isotopes a. Atoms with the same number of protons but a different number of neutrons b. Ex: Hydrogen, Deuterium, Tritium Practice Problems: 1. The atomic mass of Chlorine’s most common isotope is 35 AMU.  How many P+, e-, and N are in one  atom of Cl? 2. How many protons are there in the hydrogen ion?  How many electrons? 3. The atomic mass of Hydrogen is 1.008.  Why is it not 1.000? Electronegativity:
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Unformatted text preview: 1. How badly a given atom “wants” electrons a. The higher the electronegativity, the greater the desire. 2. Relationship between electronegativity and the periodic table a. Decreases down and to the left Answers: 1. P+: 17, e-: 17, N: 18 2. P+: 1, e-: 1 3. Isotopes 4. C, P, Mg, Pb 5. HONClFIBr, S, P b. Fluorine is the most electronegative atom 3. VERY IMPORTANT CONCEPT Practice Problems: 1. Rank in order of most electronegative to least electronegative: Magnesium, Carbon, Phosphorus, Lead. 2. What are the diatomic atoms found in nature? What are the polyatomic atoms found in nature? Questions? Email [email protected] Answers: 1. P+: 17, e-: 17, N: 18 2. P+: 1, e-: 1 3. Isotopes 4. C, P, Mg, Pb 5. HONClFIBr, S, P...
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