Humboldt State University ® Department of Chemistry

Richard A. Paselk

Chem 109 - General Chemistry - Spring 2011

Lecture Notes 3: 21 March

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Atomic Structure & Chemical Periodicity

The Periodic Table

 
Periodic Table of the Elements
 IA IIA IIIA IVA VA VIA VIIA VIIIA
   H  He
Li Be    B C N O F Ne
Na Mg IIIB IVB VB VI VIIB VIIIB IB IIB  Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
 Rb Sr  Y Zr Nb Mo Tc Ru Rh Pd  Ag  Cd  In Sn Sb Te I  Xe
 Cs  Ba Lu Hf Ta  W Re Os Ir  Pt Au  Hg Tl  Pb Bi Po At Rn

Let's look at some of the elements and see what their properties are like:

2 Na + 2 H2O right arrow 2 Na+ + 2 OH- + H2

2 Na + Cl2 right arrow 2 NaCl

Trends in Chemical Periodicity

(plots ©1994 Hanson, Harper, Paselk, & Russell)

Trends:Note the trends for

atomic size: decreases going from left right arrow right and from bottom right arrow top.

Periodic Table with Atomic Radii Trend arrow

plot of nonpolar covalent atomic radii vs. atomic number demonstrating periodicity

ionization energy: increases from left right arrow right and from bottom right arrow top.

Periodic Table with ionization energies Trend arrow

plot of first ionization energy vs. atomic number demonstrating periodicity

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© R A Paselk

Last modified 23 March 2011