Oxygen is one such element, which exists in nature but in a complex compound that is commonly referred to as air. The air that humans breathe is only partially made up of oxygen, with nitrogen, hydrogen and methane making up the majority of the atmosphere's volume. On the periodic table, there are 109 known elements in the universe.
And in order to cover the most of other countries, they added the 2 dominant languages of west (Spanish) and east (Arabic). I think if there was a rationale in choosing a language as the official language of UN, only Spanish and Arabic are chosen reasonably as they cover more than 50 countries in the world. I am sure the list of official languages in the UN would be quite different if the victorious countries were different.
Swahili is spoken by 15.5 million people as a first or as a second language (Ethnologue). Along with English, it is the official language of Tanzania, Kenya, and Uganda, and is the only African language of the African Union.Swahili is also spoken in Burundi, Malawi, Mozambique, Rwanda, Somalia, South Africa, Uganda, United Arab Emirates, and the U.S. (Ethnologue) .he Swahili-speaking populations on the East African coast served as intermediaries between the Bantu-speaking peoples in the interior of Africa and the traders on the coast who came from South Asia and Arabia. The use of Swahili spread with the growth of commerce during the colonial period in the 19th-20th centuries.