A teaspoon of neutronium would not fit in normal chemistry at all

Ordinary chemistry relies on electron shells. In the extreme densities of a neutron star, atoms are crushed and the usual periodic-table rules break down entirely. Ordinary matter is mostly empty space held up by electron shells around atomic nuclei, which is what gives chemistry its rules. Inside a neutron star, gravity is strong enough to crush those shells away entirely, packing matter into a state chemistry has no category for. "Neutronium" is not a recognised element but a popular shorthand for this crushed state, where protons and electrons are forced together into neutrons, leaving matter as dense as an atomic nucleus throughout. A teaspoon of it would weigh on the order of a billion tonnes on Earth, though it could not actually exist here: without the star's immense gravity holding it together, it would instantly blow apart back into ordinary particles. Its properties are inferred from physics models and neutron star observations rather than direct sampling, since none has ever been retrieved.

A teaspoon of neutronium would not fit in normal chemistry at all

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