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Crossword clues

Solve these clues to fill the grid.

An elementary particle with 0 charge and mass about equal to a proton
3 Across
Radioactive ___ of an atomic nucleus that is accompanied by the emission of a ___ particle
7 Across
The order of an element in Mendeleyev's table of the elements
10 Across
The change of one chemical element into another
12 Across
A hard ferromagnetic silver-white bivalent or trivalent metallic element
14 Across
An investigator who is employed to find missing persons or missing goods
15 Across
The condition of being dissociated into ions
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The ___ released by a ___ reaction
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Center of an atom or a cell
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The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
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An intensely radioactive metallic element that occurs in minute amounts in uranium ores
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An elementary particle with negative charge
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Radioactive ___ of an atomic nucleus that is accompanied by the emission of an ___ particle
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A colorless element that is one of the six inert gasses
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One of two or more atoms with the same atomic number but with different numbers of neutrons (plural)
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A heavy toxic silvery-white radioactive metallic element
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