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.
General Chemistry/Numbers Used to Describe Atoms - Numbers. 1  The Atomic number is the number of protons in the nucleus of an atom. This number determines the element type of the atom. 2  The atomic number is sometimes denoted Z. Continuing with the example of neon, Z = 10 {\displaystyle Z=10} .