Nature, Količina 104Sir Norman Lockyer Macmillan Journals Limited, 1919 |
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Stran 60
... helium to earth , and he and his colleagues provided a number of companions for argon . So , in a very short period , was recognised the existence of a group of gaseous elements forming a natural family , the molecules of which are ...
... helium to earth , and he and his colleagues provided a number of companions for argon . So , in a very short period , was recognised the existence of a group of gaseous elements forming a natural family , the molecules of which are ...
Stran 222
... helium , the presence of which in the sun's atmosphere had been detected by Lockyer twenty - five years before . The proof that helium was an inert monatomic gas like argon led to many speculations as to of the position of these new ...
... helium , the presence of which in the sun's atmosphere had been detected by Lockyer twenty - five years before . The proof that helium was an inert monatomic gas like argon led to many speculations as to of the position of these new ...
Stran 228
... helium so that all radioactive substances which emit a - rays give rise to helium . The production of helium by radioactive substances explains the occurrence of large quantities of helium in uranium and thorium minerals , and indeed ...
... helium so that all radioactive substances which emit a - rays give rise to helium . The production of helium by radioactive substances explains the occurrence of large quantities of helium in uranium and thorium minerals , and indeed ...
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