CHAPTER IX

The Octahedron Group A



This group is a very interesting one, containing as it does the element Carbon. so important in organic chemistry. The members of the group occur at the extreme limits of the left-hand swing of the pendulum. Their characteristic form is that of an octahedron, rounded at the angles and a little depressed between the faces in consequence of the rounding. In fact, it was not at first recognized as an octahedron, and was called the "corded bale ".

All these elements are tetravalent and have eight funnels opening on the eight faces of the octahedron. Here, as usual, we find that the number of funnels is twice the valence.

The conception of the four valencies of Carbon pointing to the four corners of a tetrahedron, so much used in organic chemistry, at once comes to the mind. It is obvious that if four of the eight funnels are used, these would give forces pointing in the required directions in space. This subject is further illustrated in the descriptions of the Carbon compounds in Chapter XIII.



ATOMIC
No.ANU ELEMENTCENTRERINGARMSFUNNELS
6 216 Carbon 4 - - 4 C27 + 4 C26
22864 Titanium (Ne120 + 8)12Ti144 Ti88 4 (C27 + C26 + 1)
401624Zirconium(Ne120 + 8)12Zr364 Zr2124 (C27 + C26 + 1)
582511Cerium Ce667 - - 4 (Zr212) + 4 (Ca160 + Ce36 + C27 + C26)
723211Hafnium Hf747 - - 4 (Zr212 + 4Hf36) + 4 (Ca160 + Ce36 + C27 + C26 + Ge.11)
904187Thorium Lu819 - - 4 (Zr212 + Sb128 + Ac116) + 4 (Ca160 + Mo46 + 2Li63 + C27 + C26 + 1)


OC119.JPG
FIG. 119. Titanium







OC120.JPG
FIG. 120. Zirconium





OC122.JPG
FIG. 122. CERIUM. FUNNELS A AND B

OC123.JPG
FIG. 123. HAFNIUM






 

OC124.JPG
FIG. 124. THORIUM CENTRE, Lu819

OC125.JPG
FIG. 125. THORIUM FUNNEL A

OC126.JPG
FIG. 126. THORIUM, FUNNEL. B

OC127.JPG
FIG. 127. Disintegration of Carbon and Titanium


DISINTEGRATION OF OCTAHEDRON GROUP A



Fig. 129 shows the Octahedron Group A in a condensed form, from which the relationships in this group may be studied.

OC129.JPG
FIG. 129. THE OCTAHEDRON GROUP A

OC130.JPG
FIG. 130. TYPES OF OCTAHEDRONS


Next: Chapter X   The Octahedron Group B
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