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: where Z is the atomic (proton) number, N is the neutron number, A is the mass number (A=N+Z), and X is the chemical element symbol. Approximately 3000 nuclides are known, but only about 10% of these are stable.