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.]).
There are 4 official languages in Switzerland. In order of the  percentage of the population which speak them they are: German  (63.7%), French (20.4%), Italian (6.5%) and Râ¦omansh (0.5%).  Different languages are spoken in different parts of the country.    Switzerland has four official languages.