An isotope of an element is another element that has the same number of protons but a different number of neutrons (for instance 
and 
)
The term ________ is used to describe the conversion of a solid directly to a gas, without passing through the liquid state.
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The deuteriuoted water that is consists of an isotope of hydrogen in place of hydrogen from the normal water. The approximate mass of deuteriuoted water and normal water can be calculated as {(2×2)+16} = 20. However the exact mass of
is 20.027 g/mole, whereas the mass of water can also be calculated as- {(1×2)+16}=18, however the exact mass of (
) molecule is 18.015 g/mole. Thus the difference between the mass of the molecules are (20.027 - 18.015) = 2.01 2g/mole.