Word: hydrogen
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Dates: during 1920-1929
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...chemical distinction between atoms is governed by the number of charges in the nucleus, which is the same as the number of electrons in its system. Hydrogen, the lightest known element, has one charge and one electron, like the earth and moon...
...risk of airship operation. But it costs $100 per 1,000 cubic feet and-in spite of the goldbeater's skin covering the cotton bags-it leaks out to the tune of several hundred dollars a day. The British Air Secretary now announces a different scheme, whereby cheap hydrogen will be surrounded with a shell of inert gas, minimizing fire risk at a tenth of the cost of helium...
...When the coal and oil fields are exhausted, the final substitute will be neither water power nor radium energy, but wind and sunlight. Surplus power will be generated by the formation and storage of liquid oxygen and hydrogen. The latter is, weight for weight, the most efficient known method of storing energy. It will be universally cheap, decentralizing industry, and producing no dirt...
Further proof is submitted by Professor A. Sommerfeld, of Munich, who has been lecturing in Washington. His data show that the orbits of the electrons in hydrogen and helium atoms are in accord with the lines in the spectra of these gases as predicted by Einstein...
Professor Sommerfeld first described the Rutherford idea of the structure of the atom following which he compared the atom to the stellar and solar system. He pointed out that, in general, material that is amassed is qualitative rather than quantitative except in the cases of hydrogen and helium...