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Crossword clues

Solve these clues to fill the grid.

Any of several chemical elements that are usually shiny solids that conduct heat or electricity
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The order of an element in Mendeleyev's table of the elements
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Of or being a nonmetallic element that has some of the properties of ___
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An elementary particle with negative charge (plural)
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A stable particle with positive charge equal to the negative charge of an electron (plural)
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A chemical element lacking typical metallic properties
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Something visible that by association or convention represents something else that is invisible
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The ___ used to identify the members of a ___
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An elementary particle with 0 charge and mass about equal to a proton (plural)
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A colorless odorless gaseous element that give a red glow in a vacuum tube
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