A) 1 proton 1 electron
B) 1 proton 1 neutron
C) 2 proton 1 electron
D) 1 proton 2 electron
Correct Answer: B
Solution :
Deuterium is heavy isotope of hydrogen \[{{(}_{1}}{{H}^{2}})\]| Isotopes | Number of proton | Number of | Number of |
| neutron | electron | ||
| Protium \[{{(}_{1}}{{H}^{1}})\] | 1 | 0 | 1 |
| Deuterium \[_{1}{{H}^{2}}\] | 1 | 1 | 1 |
| Tritium \[_{1}{{H}^{3}}\] | 1 | 2 | 1 |
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