Warm-Up #23 1. Text page 167 #21 List the following in increasing atomic size  Sn, Ag, As, He, Cl List the following in decreasing ionization energy 

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Warm-Up #23 1. Text page 167 #21 List the following in increasing atomic size  Sn, Ag, As, He, Cl List the following in decreasing ionization energy  P, Ni, Si, F, Ba Why do elements decrease in size as you go across the periodic table.

Homework Review

LIGHT, ENERGY, ELECTRONS AND THE PERIODIC TABLE Chapter 4 & 5 Review

Light as a Wave Frequency Wavelength Amplitude Interference Diffraction C= λν

Practice Problem Wavelength and frequency are inversely proportional What is the frequency of light that has a wavelength of x cm.

The Photoelectric Effect Energy is related to frequency High frequency=High Energy Low frequency=Low Energy Max Planck—Light is carried in quanta (packets) of energy E=h ν Einstein called the quanta photons

Practice Problem When sodium is heated, a yellow spectral line whose energy is 3.37 x J per photon is produced.  What is the frequency of this light?  What is the wavelength?

Light as a particle and a wave Hydrogen Line Emission Spectrum Bohr’s Solar System Model Louis de Broglie Heisenberg Schrodinger The Quantum Mechanical Model

Electron Configurations Principal Quantum Number—Main Energy Level (1, 2, 3,…)—Floors of office building Angular Momentum Quantum Number—Sublevels (s, p, d, f)—Offices on the florr Magnetic Quantum Number—orbitals (arrangement on the three dimensional axis)—desks per floor=n 2 Spin Quantum Number—Electrons—2 electrons per orbital—people at the desks--# per floor=2n 2

Arrangement Rules Aufbau Pauli’s Exclusion Hund

Practice Problems Write the electron configuration, the noble gas notation and orbital diagram for the following  Ar  Br  Al  Sn

The Periodic Table Mendeleev and Moseley Repeating patterns, properties in groups Vertical groups share physical and chemical properties s,p,d,f blocks Alkalai metals Alkaline earth metals Halogens Noble gases

Valence Electrons Outer shell electrons (s and p only) These are the only electrons available to be gained, lost or shared Lose valence electrons, become positively charged— cation Gain valence electrons, become negatively charged-- anion

Stability Atoms want to achieve noble gas configurations with full outer levels Chlorine gains one electron to become like Argon. Potassium loses one electron to become like Argon.

Periodic Trends Atomic Radius Ionic Radius Ionization Energy Electronegativity

Periodicity Activity

Homework—Due Thursday 11/5 Complete Chapter 4 and 5 Review Sheet Prepare Notebooks Exam Chapter 4 & 5 on Thursday

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