week03 - 1 CH 2. Atoms, ions and the periodic table Daltons...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 CH 2. Atoms, ions and the periodic table Daltons Atomic Theory Structure of the Atom Ions Atomic Mass Math toolbox 1.1 (pp. 36- 3 7) The Periodic Table Daltons ( modern ) Atomic Theory Daltons Atomic Theory has 4 postulates: 1. All matter is composed of exceedingly small, indivisible particles called atoms . 2. All atoms of a given element are identical both in mass and in chemical properties . However, atoms of different elements have different masses and different chemical properties. 3. Atoms cannot be created or destroyed in chemical reactions. 4. Atoms combine in simple, fixed, whole-number ratios to form compounds. This was proven wrong later - see isotopes Structure of the Atom Nuclear Atom Atom is divisible and made of subatomic particles Subatomic particles include: Electrons: outside nucleus; negatively charged Particles in the nucleus Protons: positively charged Neutrons: uncharged 2 The Discovery of Electrons (1897) Figure 2.5 J.J. Thomson proved The existence of electron Negative charge Pudding model ( incorrect ) Charge/mass ratio Charge by oil drop experiment (Millikan, see p.58) Rutherford: The Nuclear Atom Subatomic Particles ( Table 2.1, p.60 ) Proton ( p ): Q = +1.6022 x 10-19 C (expressed as +1 ) m = 1.6726 x 10-24 g ( hydrogen atom ) Neutron ( n ): no charge m = 1.6749 x 10-24 g Electron ( e ): Q = - 1.6022 x 10-19 C (expressed as - 1 ) m = 9.1094 x 10= 9....
View Full Document

This note was uploaded on 02/14/2011 for the course CHEM 111 taught by Professor Cao during the Fall '07 term at Purdue University-West Lafayette.

Page1 / 8

week03 - 1 CH 2. Atoms, ions and the periodic table Daltons...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online