... a positive central nucleus , where most of the atom's mass is concentrated, and . one or more negative electrons . Nucleus and electrons are held together by the electric attraction between positive (+) and negative (-) charges. ... When such processes occur in air, they produce there free ions and electrons, which can move and carry an electric current, something neutral atoms cannot do. ... The next heavier atom is that of helium (chemical symbol He) and it contains two electrons. ...
... On 4 April 2005, INTAS, the International Association for the promotion of cooperation with scientists from the New Independent States(NIS) of the former Soviet Union, launched the first stage of its Open Call for Research Projects Proposals 2005-2006. With an indicative budget of ?12 million, the INTAS Open Call 2005-2006 encompasses basic and applied research with no thematic orgeographical restrictions, but excluding market-oriented technology development. ...
Titan . ... Hubble Space Telescope Images of Titan's surface . ... Later that year, it will release the European-built Huygens probe for a descent through Titan's atmosphere. ... This artist's rendering shows the European Space Agency's Huygens probe descending into the atmosphere of Saturn's moon Titan after being released by NASA's Cassini spacecraft. ... This artist's rendering shows the Huygens probe on the surface of Saturn's moon Titan after being released by NASA's Cassini spacecraft. ...