the others. This property of reflecting light is known as luster. Metals have a metallic luster which is peculiar to themselves; and this, for the present, may be regarded as their chief c

s second by a third, the third by a fourth, and so on. For expedition, three pupils can work toge

sition o

es. Remove the lamp. 3 Ag + 4 HNO3 = 3 AgNO3 + 2 H2O + NO. Then add 10 cc. H2O, and at once put in a short piece of Cu wire, or a cent. Leave till quite a deposit ap

in dilute HNO3, as in Experiment 35, and dilute t

d set aside as before, examining th

osition

s ones, dissolving a small piece of Pb, and using a strip of Zn to precipita

nger than either Ag, Cu, or Pb. We. express this affinity by saying that Zn is the most positive of the four metals, while Ag is the most nega- tive. Cu is positive to Ag, but negative to Pb and Zn. Which of the four elements are positive to Pb,

Each in union with O and 1=I gives rise to a very important cl

is made up of two parts, Na2 being positive, the radical SO4 negative. Like elements, radicals are either positive or negativ

ydrogen- oxygen. Take away H from the symbol of water, H-O-H, and hydroxyl -(OH) with one free bond is left. If an element takes the place of H, i.e. unites with OH,

It is a constituent of both acids and b

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