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It doesn't entirlely stand alone. there is no gap from hydrogen and the rest of the table. Hydrogen is just simply singular. It only has one proton. No neutron. One of a kind. even though I believe deutrium to be number 2 on the table rather than helium. And neutronium should be classified as element 0. Should be categorized in the periodic tables at all time.

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13y ago
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15y ago

The symbol Mn on the Periodic Table stands for

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15y ago

Most of them; only a few (Nitrogen, Oxygen, Flouride and others in flouride's column) are diatomic

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15y ago

Ununseptium

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11y ago

Hydrogen

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Q: What is the only element in the periodic table that does not belong to a group?
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