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1
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Present in uranium ores in tiny amounts, this element is created when needed by bombarding radium with neutrons in a nuclear reactor
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2
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Cerussite, a poisonous, white compound of this element was once used to color paint
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3
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This element's chemical symbol is Yb
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5
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All atoms of this element contain 91 protons
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8
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This element's name comes from the Greek word meaning 'inactive'
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9
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All atoms of this element contain 26 protons
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12
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This element has the highest melting point of all metallic elements
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13
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This element was named for a Russian Research Laboratory
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14
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This element's chemical symbol is Ne
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15
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It is believed that the Sudbury region of Canada is rich in this element because an ancient meteor impact
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17
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Concentrations as low as 1,000 parts per million of this poisonous gas can kill you
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