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 (Krauss book) 1995 bestseller, "The Physics of Star Trek"." Atom (Krauss book) Atom: An Odyssey from the Big Bang to Life on Earth...and Beyond is the sixth non-fiction book by the American theoretical physicist Lawrence M. Krauss. The text was published on April 1, 2001 by Little, Brown. Krauss won the Science Writing Award (2002) for this book. In this book Krauss discusses creating parts of an oxygen atom, the primary atoms of the Big Bang. Then he follows it through the remaining history of the Universe. As time has been passing by, the atom was a part of a supernova and