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
Captain Atom (Atlas Publications) a visual reference to Captain Atom in the Watchmen comic book. In the origin story of Dr Manhattan (who is based on the Charlton Comics Captain Atom), the character is shown rejecting a helmet which is part of his US Government-supplied costume. The helmet design and the overall costume, although a different colour, somewhat resemble that of the Atlas Comics Captain Atom. The British artist, Dave Gibbons, may have been familiar with the Australian character. Captain Atom (Atlas Publications) Captain Atom was an Australian comic book series created and written by Jack Bellew with illustrations by Arthur Mather. It was