What is a solid nonmetal that contains 53 neutrons in its nucleus?

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Don't think one exists. All non-metals that are solid have more than 53 protons, so they would have at least 53 neutrons, and the lightest is iodine which has 74 neutrons.

What atom's nucleus contains neutrons?

All atomic nuclei contain one or more neutrons except hydrogen-1, which has just a single proton as its nucleus. This isotope of hydrogen is the only atom that has no neutro