CHEM 1030 Lecture Notes - Lecture 2: Nuclide, Radiography, Ionic Compound

• School: Auburn University
• Department: Chemistry
• Course: CHEM 1030
• Professor: undefined

Document Summary

Chapter 2 atoms, ions, and molecules: the building blocks of matter. Beam from cathode ray tube was bent by magnetic or electric elds. Saw that mass to charge ratio of the particles was the same no matter what cathode material he used. These electrons were fundamental particles found in all matter. Thomson determined charge-to-mass ratio of electrons = 1. 76 x 10 ^ 8 c/g. C is coulomb, the derived si unit of electric charge: robert millikan (1909) Determined the charge of an electron = -1. 602 x 10 ^ -19 c. Knowing charge, he used thomson"s mass-to-charge ratio to nd mass of an electron: m e = 9. 109 x 10 ^ -28 g. Thomson"s plum-pudding model: scientists knew matter was neutral, so if negative subatomic particles existed, Tuesday, january 16, 2018 positive subatomic particles must too: plum-pudding model: Electrons distributed throughout di use, positively charged sphere. X-rays: wilhelm r ntgen (1845-1923) discovered x-rays.