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Reliable data on religious demography is difficult to obtain because an official nationwide census has not been conducted in decades. U.S. government estimates indicate a population of approximately 30.4 million, with Sunni Muslims comprising 80% of the population, Shia Muslims making up about 19%, and other religious groups comprising less than 1%.
Deuterium (hydrogen-2, symbol 2 H or D, also known as heavy hydrogen) is one of two stable isotopes of hydrogen; the other is protium, or hydrogen-1, 1 H. The deuterium nucleus (deuteron) contains one proton and one neutron, whereas the far more common 1 H has no neutrons.