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- Carbon (15360 bytes)
2: ...[[atomic number]] 6. An abundant [[nonmetal]]lic, tetravalent element, carbon has several [[Allotropes of carbo... - Hafnium (9162 bytes)
156: ...nd [[atomic number]] 72. A lustrous, silvery gray tetravalent [[transition metal]], hafnium resembles [[zirconi... - Silicon (13233 bytes)
44: ...the symbol '''Si''' and [[atomic number]] 14. A [[tetravalent]] [[metalloid]], silicon is less reactive than it...
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