| dbp:text
|
- The literature is replete with suggested modifications of the M periodic table. In fact so many modifications have appeared that one is tempted to conclude that practically every author has his [sic] own concept of what a workable arrangement must be. Unfortunately, the majority of the tabulations proposed are either unwieldy or utterly worthless, and only a few valuable suggestions have been made. Geometry does not permit of an arrangement which is sufficiently ideal to serve all the required purposes equally well. Thus the many three-dimensional models, embracing globes, helices, cones, prisms, castles, etc., are interesting but lacking in utility. To a lesser extent, the more involved two-dimensional arrangements do little toward solving the difficulty, and essentially the only suggestions as to modifications which are truly constructive are those centering in reflection of electronic configurations.
Certainly the most useful of these modifications, and at the same time one of the earliest to be proposed, is the so-called long or [18-column]...table. (en)
|
.svg?width=300)
.svg){kind=link}
.svg){kind=link}
.png){kind=link}
.png){kind=link}
.jpg){kind=link}
.svg){kind=link}
.svg){kind=link}
