Assertion: metal's oxidation state | /r/HasProperty | high
Facets:
value: for true ionicity
type: PURPOSE
Source sentences:
text: These can most easily occur when the metal is in a high oxidation state.
text: The shift from the hypoelectronic elements in group 13 and earlier to the group 14 elements is illustrated by the change from an infinite ionic structure in aluminium fluoride to a lattice of simple covalent silicon tetrafluoride molecules, as dictated by the lower electronegativity of aluminium than silicon, the stoichiometry (the +4 oxidation state being too high for true ionicity), and the smaller size of the silicon atom compared to the aluminium atom.