The Periodic 2 able. 



287 



In the same diagram the curve " c " has been drawn to 

 show the slope of: the beam at the ends of the reinforcement. 



Fig. 3. 



fiat/o o^ j, to 



" I " denotes the moment of inertia of the plate section, 

 and "I/' the moment of inertia of the section through the 

 "plate and reinforcement" combined, about axes through 

 their respective centres of area. 



XX XVI. The Periodic Table. A Modification more in accord 

 with Atomic Structure. By Ivan D. Margary, B.A* 



IN view of the recent advances in the elucidation of atomic 

 structure which show that the inert gases of the Helium 

 Group are the final members of each series of the Periodic 

 Table, it seems desirable to have the usual simple form of the 

 table arranged in a manner which shows this clearly. 



It could be done quite easily by placing the group on the 



right of the table after Group VII, as shown in the diagram, 



instead of in its customary place on the left in front of Group I . 



Such a plan would indicate that each member of Group 



* Communicated by the Author. 



