Humboldt State University ® Department of Chemistry

Richard A. Paselk

Chem 110	General Chemistry	Fall 2003
Lecture Notes::Lec 23_24 October	© R. Paselk 2003
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The Chemistry of the Elements

The Representative Elements

Chemical Demos - Period 3; Group 1 and 17. Flame colors for Group 1 and Group 2 metals.

Properties of Group I - the Alkali Metals

Property		Li	Na	K	Rb	Cs	Fr
Valence-shell electron configuration		2s1	3s1	4s1	5s1	6s1	7s1
Melting point (°C)		180	98	64	39	29	-
Density (g/cm3)		0.54	0.97	0.86	1.5	1.9	-
Ionization energies - 1st & 2nd (kJ/mol) M(s) Æ M+(aq) + e-		520 7296	496 4563	419 3069	403 2650	376 2420	370 2170
Standard Reduction Potentials (V, 25°C) M+(aq) + e- Æ M(s)		-3.04	-2.71	-2.92	-2.92	-2.93	-
Electronegativity		1.0	0.9	0.8	0.8	0.7	0.7

© R A Paselk

Last modified 24 October 2003