Hydrogen and deuterium can be represented by the nuclide symbols ${}_1^1H$ and ${}_1^2H$ respectively. What is a difference between hydrogen and deuterium?
1 )
The deuterium atom has twice the number of electrons as the hydrogen atom.
2 )
The deuterium nucleus has a charge, but the hydrogen nucleus has no charge.
3 )
The deuterium nucleus has less mass than the hydrogen nucleus.
The deuterium nucleus has half the charge per unit mass of the hydrogen nucleus.
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