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.
The sum of the number of protons and neutrons in the nucleus of an atom is called the mass number (A), or nucleon number. For isotopes of an element, the mass number is always different (because the number of neutrons changes and neutrons contribute to the mass number).or example, the number of protons in any atom of hydrogen is 1, and the number of protons in any atom of helium is 2. The number of protons in the nucleus of an atom is called its atomic number (Z), which identifies the atom.