CHEM101 Lecture Notes - Lecture 2: Rutherford Model, Electric Discharge, Robert Andrews Millikan

• School: University of Alberta
• Department: Chemistry
• Course: CHEM101
• Professor: Yoram Apelblat

Document Summary

For a given compound the ratio of elements can be reduced to small whole numbers. Substructure of the atom: each element is made of tiny indivisible particles. Electrical discharge in cathode tube see fig 2. 4: atoms of a given element are identical; atoms of different elements are different, compounds are formed when atoms of different elements combine. A given compound always has the same relative numbers and types of atoms: reactions involve reorganization of the atoms change of the way they bound together. Radioactivity = when small particles ( , particles) and/or electromagnetic radiation ( rays) are emitted by unstable atomic nuclei. Alpha particle ( ) carries 2 positive charge and have essentially the same mass as a helium atom = he2+ Beta particle ( ) negatively charged particle with the same properties as the electron. Gamma rays ( ) electromagnetic radiation of high penetrating power. Particle bombardment of metal foil see fig 2. 6.