October 2018 2 29 Report

W jaki sposób ustalić wartościowość związki chemicznego? Np:

-tlenek chromu(VI),

-tlenek litu (dlaczego tu nie ma wartościowości?),

-tlenek ołowiu (II) dlaczego II?

Proszę o wytłumaczenie w jaki sposób ustala się wartościowość. PS daje naj**

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