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OpenStudy (anonymous):

this element is lighter than hafnium, has a greater electronegatiivity than scandium, and is used in aircraft

OpenStudy (anonymous):

Aluminum fits both of these characteristics. Elements on the upper part of the periodic table are lighter than the ones on the bottom Electronegative trend of the periodic table is in this direction, with F being the most electronegative and ignoring the noble gases (they have full octet already): |dw:1351822341433:dw|

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