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The hydrogen isotope with one proton and one neutron is:
APalladium
BRuthenium
CDeuterium
DNeptunium
Answer & Solution
Correct answer: C. Deuterium
1. This isotope is heavier than ordinary hydrogen.
2. The one containing 1 proton and 1 neutron is called deuterium.
3. So the correct answer is deuterium.
_Source: syllabus Chemistry, Ch 2 'Structure of Atom'_
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