Atom to the positively charged nucleus by the attraction created from opposite electric charges. If an atom has more or fewer electrons than its atomic number, then it becomes respectively negatively or positively charged as a whole; a charged atom is called an ion. Electrons have been known since the late 19th century, mostly thanks to J.J. Thomson; see history of subatomic physics for details. Protons have a positive charge and a mass 1,836 times that of the electron, at . The number of protons in an atom is called its atomic number. Ernest Rutherford (1919) observed that nitrogen under alpha-particle
Atom Ant Atom" is available on the DVD "Saturday Morning Cartoons 1960s Vol. 1". The episode "Atom Ant Meets Karate Ant" is available on the DVD "Saturday Morning Cartoons 1960s Vol.2". The episode "The Big Gimmick" is available on the DVD "Best of Warner Bros. 25 Cartoon Collection Hanna-Barbera". On October 6, 2015, Warner Archive released "Atom Ant: The Complete Series" on DVD in region 1 as part of their Hanna–Barbera Classics Collection. This is a Manufacture-on-Demand (MOD) release, available exclusively through Warner's online store and Amazon.com. In 2016, "The Atom Ant Show" was made available for download via iTunes Store. Both