XF₄ compounds are typically tetrafluorides formed by elements in groups 14–16 (mainly Sn, Si, Te, etc.). Scandium (Sc) is a transition metal and does not form a stable tetrafluoride, so it cannot be X in XF₄. Tin (Sn) and Silicon (Si) can form SnF₄ and SiF₄, respectively.
Compound has the formula XF₄. The element X cannot be ______?
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