8 



Prof. T. Carnelley on the Periodic Law. 



first member of each series to the fourth or middle (tetrad) 

 member, and then diminish to the seventh or last member. 

 For illustrations see Table IV. 



Table IV.— 



Illustrating 



Relations 5, 



6, and 7. 







Br.— CI. 



I.— Br. 



I.— CI. 



io-tJ 

 s d 

 £ 'o 



3 



•s ft 



ew O 



S a 

 w 



-£ o 

 ■© P-i 



3 



fl.S 



•s & 



ew 2 i 



g a 1 

 w 



S.S 



CD Ph 



3 



fl.S 

 a 



•3 ft 



3 



1 1 



w 



Na 



-64 

 -10 



26 

 55 

 52 

 41 

 31 



"80" 

 95 

 93 

 69 

 46 



7100 

 5500 

 9170 

 9300 

 7066 



-80 

 -75 

 32 

 133 

 76 

 75 

 69 



"90* 

 137 

 131 

 122 



87 



16500 

 16000 1 

 14960 j 

 16100 



9300 







1 



1 



-144 



- 85 

 58 

 188 

 128 

 116 

 100 



170 



232 

 224 

 191 

 133 



23600 

 21500 

 24130 

 25400 

 16368 



Mg 



Al 



Si 



P 



S 



CI 









Table V. — Illustrating Kelations 5, 7, and 8. 





Br.— 01. 



I.— Br. 



I.— CI. 







Z&3 



±1 '0 

 "© P-I 



3 



Boiling- 

 point. 



Heat of for- 

 mation. 



Melting- 

 point. 



pi £ 



'A 

 •0 ft 



f-{ 



£ (4 



3 



g a 

 w 



Melting- 

 point. 



c .5 

 A 

 •3 ft 



£ g 



«t-i O 



^J3 53 



g a 

 w 



c 



133? 

 55 

 66 

 53 

 41 

 49 

 25 



Ill 



95 9300 



95 i 



89 



60 | 



86 2850 

 55 ' 



56? 

 133 

 I 111 

 128 



88 

 116 



81 



158 

 137 

 130 

 137 

 126 

 94 

 124 



lisioo 



8850 



189 

 188 

 177 

 181 

 129 

 165 

 106 



269 

 232 



225 



25400 



Si 



Ti 



EkaSi ... 

 Zr 



226 i 

 186 

 180 11700 



179 



Sn 



Ce 









Relation 7. 77? 6 difference between the melting-, or boiling- 

 points, or heats of formation of the bromide and chloride of an 

 element is less than that between those of its iodide and bromide, 

 and the latter less than that between those of its iodide and 

 chloride. For illustrations see Tables IV. and V. 



Relation 8. The differences between the melting-points, or 

 boiling-points, or heats of formation diminish as the atomic 

 weight of the positive element increases, except in the case of the 

 melting-points of the even members of the second group, for 

 which the opposite relation holds good. 



This is illustrated by Table V., which represents the carbon- 

 silicon group of elements, the even members of the group being 

 given in ordinary and the odd members in black figures. 



