[INTRODUCTION 



25 



Fluorine, F =19. 

 Chromium, Cr =- r >2. 

 Maiiu-anc.se, M M=")"). 

 Co=i>9. 



Cobalt, 



Nickel, 



Copper, 



Zinc, 



Arsenic, 



Bromine, 



Cu= 

 Zn= 



AS: 



Br = 



Strontium, Si- 

 Silver, AO 

 Cadmium, Cd 

 Tin, Sn 

 Antimony, Sb 

 Iodine, I 



=63. 



:<;:>. 



:7">. 



= 80. 



= 87. 



= 112. 



= 118. 

 = 122. 

 = 127. 



Barium, Ba = 137. 



Platinum, Pt =196. 



Gold, Au=197. 



Mercury, Hg=200. 



Lead, ' Pb=207. 



Bismuth, Bi =208. 



Uranium, U =240. 



As fluor spar. Cal%, and as hydrofluoric 

 ,u id, HF. 



As chromic anhydride, CrO 3 , and potas- 

 sium dichromate, K 2 Cr 2 O 7 . 



As manganese peroxide, Mn0 2 , and po- 

 tassium permanganate, MnKO 4 . 



In smalt and blue glass. 



For electro-plating other metals. 



The well-known red metal. 



Used for the plates of batteries, roofing, &c. 



White arsenic, As 2 3 . 



A brow T ii volatile liquid ; sodium bromide, 

 NaBr. 



In coloured tires (SrN,O 6 ). 



The well-known white metal. 



In alloys. Yellow paint (CdS). 



The well-known metal. 



In alloys such as type metal. 



In medicine and photography ; free, and as 

 KI. 



" Permanent white," and as an adulterant 

 in white lead, and in heavy spar, BaS0 4 . 



^Well-known metals. 



) 



In medicine and fusible alloys. 

 In green fluorescent glass. 



The compounds of the following metals and semi-metals have fewer 

 applications, but are well known, and are somewhat frequently met 

 with in nature, although in small quantities : 



Palladium, Pd=106. 

 Cerium, Ce=140. 

 Tungsten, W =184. 

 Osmium, Os=193. 

 Iridium, Ir=195. 

 Thallium, Tl=204. 



Molybdenum, Mo =.96. 



The following rare metals are still more seldom met with in nature 

 and are not yet applied to the arts, but have been studied somewhat 

 fully : 



