CH 301 - Chapter 12 part 1 Lecture Notes

CH 301 Chapter 12 - Chapter 12 Atoms The Quantum World KEY POINTS Electromagnetic Radiation Quantum Numbers and Atomic Orbitals Electron

Info iconThis preview shows pages 1–22. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 12: Atoms: The Quantum World KEY POINTS Electromagnetic Radiation Quantum Numbers and Atomic Orbitals Electron Configurations Periodic Properties
Background image of page 1

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

View Full DocumentRight Arrow Icon
nucleus
Background image of page 2
Fundamental Particles Particle Mass (amu )C h a r g e Electron 0.00054858 -1 Proton 1.0073 +1 Neutron 1.0087 0
Background image of page 3

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

View Full DocumentRight Arrow Icon
The Discovery of Electrons • Thomson: Cathode ray tubes experiments; late 1800’s & early 1900’s.
Background image of page 4
Mass Number and Isotopes The mass number (A) is the sum of the number of protons and neutrons. Z = proton number N = neutron number A = Z + N A common symbolism used to show mass and proton numbers is: 12 48 197 62 0 7 9 A Z Ex. C Ca E Au
Background image of page 5

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

View Full DocumentRight Arrow Icon
Background image of page 6
24 Cr 51.998
Background image of page 7

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

View Full DocumentRight Arrow Icon
The Atomic Weight Scale and Atomic Weights Example : Naturally occurring chromium consists of four isotopes. It is: 4.31% 50 Cr, mass = 49.946 amu 83.76% 52 Cr, mass = 51.941 amu 9.55% 53 Cr, mass = 52.941 amu 2.38% 54 Cr, mass = 53.939 amu ¾ Calculate the atomic weight of chromium.
Background image of page 8
Electromagnetic Radiation Molecules interact with electromagnetic radiation. Molecules can absorb and emit light. Once a molecule has absorbed light (energy), the molecule can: 1. Rotate 2. Translate 3. Vibrate 4. Electronic transition
Background image of page 9

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

View Full DocumentRight Arrow Icon
Electromagnetic radiation: oscillating electric and magnetic fields Wavelength λ λ
Background image of page 10
Frequency and Wavelength
Background image of page 11

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

View Full DocumentRight Arrow Icon
Electromagnetic Spectrum
Background image of page 12
Background image of page 13

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

View Full DocumentRight Arrow Icon
Background image of page 14
Energy/wavelength/frequency E λ ν c = νλ c = 3.00 x 10 8 m/sec, a constant! h = 6.626 x 10 -34 J sec, a constant! E = h ν= hc λ
Background image of page 15

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

View Full DocumentRight Arrow Icon
Background image of page 16
• Example 1) What is the wavelength ( λ ) of light with a frequency ( ν ) of 2.73 x 10 16 /sec? • Ex. 2) Calculate the energy (E) of a photon with a frequency ( ν ) of 2.73 x 10 16 /s. Useful equations: c = ν λ c = 3.00 x 10 8 m/sec h = 6.626 x 10 -34 J sec E = h ν = h c λ
Background image of page 17

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

View Full DocumentRight Arrow Icon
“Black Body”: emits a wide range avelengths intensity depends on temperature
Background image of page 18
Oscillations of Atoms/Molecules C O H H C O H H h v .. .
Background image of page 19

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

View Full DocumentRight Arrow Icon