WHAT ARE RADIOISOTOPES ? Many of the chemical elements have a number of isotopes. The isotopes of an element have the same number of protons in their atoms (atomic number) but different masses due to different numbers of neutrons. In an atom in the neutral state, the number of external electrons also equals the atomic number.
Bogota. Colombia's capital of Bogota is in the central part of the country. The city is situated in the Andes mountain chain and is surrounded by five rivers, including the Bogota River.Bogota is considered the educational and cultural center of Colombia.olombia's capital of Bogota is in the central part of the country. The city is situated in the Andes mountain chain and is surrounded by five rivers, including the Bogota River.
Colombian festivals and holidays. Colombia is one of the countries in the world with the most national public holidays, with some 20 days spread throughout the year. The Colombian calendar is also peppered with a large number of carnivals and festivals, which bear witness to the national love of celebration. As a Catholic country, the most important celebrations are those held around Christmas and Easter time.