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.
A nuclide can be specified by the notation shown in the figure where X is the chemical element symbol, Z is the atomic number (number of protons in the nucleus), N is the neutron number (number of neutrons in the nucleus), A is the mass number (A=N+Z, total number of nucleons in the nucleus).