Hydrogen has a mean weight of 1.00794 u and was discovered in 1766
Heavy water is water whose atomic structure consists of oxygen and heavy hydrogen. Heavy hydrogen, or deuterium, is hydrogen with neutrons in its nuclei.
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Since heavy water contains an isotope of hydrogen 2H or more commonly called Deuterium means that the hydrogen atom in heavy water will have an extra neutron in the nucleus.
Water that contains hydrogen-2 instead of hydrogen-1 is called heavy water.
deuterium
Type your answer here... The hydrogen atoms in heavy water have a neutron in the nucleus, doubling the mass.
Compared to Osmium it is light, compared to Hydrogen it is heavy
Heavy water, D2O contain deuterium in lieu of hydrogen. Deuterium,D is a natural isotope of hydrogen with 1 proton and 1 neutron; hydrogen,H has only 1 proton.
My theory to why heavy atoms are not appreciably larger than the hydrogen atom is supposedly because that gases can expand and so that hydrogen is a gas, it is larger though if hydrogen were compressed, it should grow appreciably smaller than heavy atoms. Also to make that test fair you would have to make the heavy atom at its gas state so that then you could see the true, fair differ in size between a hydrogen and heavy atom.
Heavy water is heavier than light water because instead of both hydrogen atoms in the molecule being ordinary light hydrogen (H - one proton) one or both hydrogen atoms are heavy hydrogen (D - one proton, one neutron).
it is called heavy water