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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.
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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 neutrons