As of 2013, the United States spends about $554.2 billion annually to fund its military forces, and appropriates approximately $88.5 billion to fund Overseas Contingency Operations. Put together, the United States constitutes roughly 39 percent of the world's military expenditures.
the number of protons in the nucleus of an atom of a particular element. In a neutral atom, the atomic number equals the number of electrons. See also atom, electron, proton.
(Z) (Ä-tom'ik nÅ­m'bÄr) The number of protons in the nucleus of an atom; it indicates the position of the element in the periodic system. n the number of protons within an atom's nucleus. a symbol, as a figure or word, expressive of a certain value or a specified quantity determined by count. atomic number.