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CHEM 1035

by: Words'nNotes
Virginia Tech
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About this Document

Covers: atomic theory, models, and the parts of nuclear symbols
General Chemistry
Class Notes




Popular in General Chemistry

Popular in Chemistry

This 3 page Class Notes was uploaded by Words'nNotes on Sunday September 4, 2016. The Class Notes belongs to CHEM 1035 at Virginia Polytechnic Institute and State University taught by Neidiigh in Fall 2016. Since its upload, it has received 5 views. For similar materials see General Chemistry in Chemistry at Virginia Polytechnic Institute and State University.


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Date Created: 09/04/16
Atomic theory- -Proposed by John Dalton in 1807 (Not all parts have held true)  Atoms are small, indivisible particles (False)  All atoms of a specific element are identical but atoms of different elements are different (False)  Atoms can come together to form compounds  Chemical reactions reorganize atoms but don’t change them The discovery of the electron- Electrons were discovered by the use of a cathode ray A beam of electrons was passed through the tube, the effects of a magnet on the electron beam proved the charge of the particles, the beam was repelled from the negative end of a magnet and attracted to the positive Parts of the Atom- An atom is made up of three sub-atomic particles: protons, neutrons, and electrons Year charge mass Relative discovered mass Electron 1897 (-1) 9.11x 10- 0.00055 28 g Amu Proton 1908 (+1) 1.673x 10- 1.00728 2g Amu - Neutron 1932 (0) 24675x 10 1.00867 g Amu *Amu = atomic mass unit A proton is more than 1800 times heavier than an electron Atomic Models- Plumb pudding model: the first model, showed electrons and protons distributed randomly throughout the atom Plumb pudding model Rutherford’s model: this model showed that atoms were mostly empty space and disproved the plumb pudding theory Nuclear symbols- A X z A = the atomic mass number, can be used to show the number protons and neutrons Z = the atomic number, shows the identity of the element X = elemental symbol The number of neutrons can be calculated by subtracting z from a (A - Z = N) When writing the symbol for an element that has two letters the first letter is capitalized and following numbers are lowercase: C – Carbon He – Helium This is to differentiate between elemental symbols and compounds Co – Cobalt CO – Carbon and Oxygen


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