The law of conservation of charge was established in the 18th century. The electron, a carrier of negative electric charge, was discovered at the end of the 19th century, and the proton, which has a positive charge of equal magnitude, was discovered at the beginning of the 20th century.
Which official languages do they speak in Switzerland? Switzerland's four official languages, traditionally spoken in different regions of the country, are German, French, Italian and Rumantsch [sometimes also transcribed as Romansh, Romansch Rhaeto-Romanic or even Romance etc.]).
Most people from the U.S. think of Swiss people as German-speakers, but they dialect of German is quite different there, and is accompanied by different spellings, a different accent, etc. Some Swiss people also speak French, and others speak Italian (in terms of a native language). Then there are tiny regions in Switzerland where the primary language is Romansch. But I believe that English is common enough in Switzerland that you could communicate in English and they would understand you.