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deuterium vs. hydrogen

[ doo-teer-ee-uhm, dyoo- ]
/ duˈtɪər i əm, dyu- /

noun
  1. an isotope of hydrogen, having twice the mass of ordinary hydrogen; heavy hydrogen. Symbols:2H, D; atomic weight: 2.01; atomic number: 1.
[ hahy-druh-juhn ]
/ ˈhaɪ drə dʒən /

noun
  1. a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. Symbol: H; atomic weight: 1.00797; atomic number: 1; density: 0.0899 grams/liter at 0°C and 760 millimeters pressure.

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