The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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الصفحة 11
... fact that the elements fall into periodic groups and that substances oc- cupying similar places in the different periods have very similar properties . Thus each period starts with an inert gas. THE EARTH AND ITS ELEMENTS IT.
... fact that the elements fall into periodic groups and that substances oc- cupying similar places in the different periods have very similar properties . Thus each period starts with an inert gas. THE EARTH AND ITS ELEMENTS IT.
الصفحة 12
... substance so actively poisonous . In the same way , sulphur has two gaps to fill up , and its behavior is largely governed by that fact .. ... ... Atoms may share electrons with one another , each being capa- ble , apparently , of ...
... substance so actively poisonous . In the same way , sulphur has two gaps to fill up , and its behavior is largely governed by that fact .. ... ... Atoms may share electrons with one another , each being capa- ble , apparently , of ...
الصفحة 13
... substances . The element having the greatest atomic weight and standing at the top of the natural scale is uranium 238.2 . This is followed by thorium , actinium and radium . It has been learned that the beta ray given off by radium is ...
... substances . The element having the greatest atomic weight and standing at the top of the natural scale is uranium 238.2 . This is followed by thorium , actinium and radium . It has been learned that the beta ray given off by radium is ...
الصفحة 14
... substance , there are still spaces between them as between the peas in a jar . " Even the diamond is full of holes like the sponge . If the holes were filled up by other carbon atoms the density of the diamond would be doubled , for ...
... substance , there are still spaces between them as between the peas in a jar . " Even the diamond is full of holes like the sponge . If the holes were filled up by other carbon atoms the density of the diamond would be doubled , for ...
الصفحة 15
... substances which appear to be perfectly at rest- the table , a piece of paper , the water in a glass - are all in mo ... substance , then , has its freezing or melting points at which it changes form . At ordinary temperatures most ...
... substances which appear to be perfectly at rest- the table , a piece of paper , the water in a glass - are all in mo ... substance , then , has its freezing or melting points at which it changes form . At ordinary temperatures most ...
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acres Africa America appears areas Asia atoms average bacteria believe birds body carbon carbon dioxide cause cent century cephalic index changes characters chromosomes civilization climate color common copper crops cultivated culture danger Darwin death rate destroy disease domestic early earth eggs environment Europe European evidence fact feeble-minded females fish forms germ cells given heredity human Ibid important increase Indians individual inheritance insane insects iron killed known land later light living male man's marriage metals miles natural selection nature Negro neolithic organisms ovum oxygen Pará rubber tree parasites physical population possible pounds present problems produced R. S. LULL race seeds seems social South South America species square mile supply T. H. MORGAN temperature things thousand tion to-day trees tropics types United wild woman women