Humboldt State University ® Department of Chemistry

Richard A. Paselk

Chem 110

General Chemistry

Summer 2006

Lecture Notes::Lec 18_23 June

© R. Paselk 2006
 
     
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The Representative Elements, cont.

Chemistry of the Alkali Metals, cont.

Group II - the Alkaline Earth Metals

Physical Properties

Properties of Group II - the Alkaline Earth Metals

Property Be Mg Ca Sr Ba Ra
Valence-shell electron configuration 2s2 3s2 4s2 5s2 6s2 7s2
Melting point (°C) 1280 651 851 800 850 960
Density (g/cm3) 1.86 1.75 1.55 2.6 3.6 5.0

Ionization energies - 1st ,2nd & 3rd (kJ/mol)

M(s) M2+(aq) + 2 e-

899

1757

14849

738

1450

7730

590

1145

4941

549

1064

4207

503

965

3420

509

978

-

Standard Reduction Potentials (V, 25°C)

M2+(aq) + 2 e- M(s)

-1.69 -2.37 -2.87 -2.89 -2.91 -2.92
Electronegativity 1.5 1.2 1.0 1.0 0.9 0.9

Chemistry

Beryllium is exceptional, as are other Period 2 elements as a result of small radii and consequently strong bonding.

Properties of the remaining Alkaline Earths are more similar.


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