<p>Hydrogen 2 or Deuterium (D) has 2 protons and 1 inner electron. It represents the first basic building block and also the 'new neutron' definition. </p>
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<p>Hydrogen 2 or Deuterium (D) has 2 protons and 1 inner electron. It represents the first basic building block and also the 'new neutron' definition. </p>
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