Un compus al unui metal M care contine 20 protoni in nucleu, contine alaturi de acesta oxigen si un alt nemetal Y ce are configuratia electronica K=2e, L=8e, M=6e. Stiind ca masa acestui compus respecta relatia M=6 * nr neutronilor din nucleul Y, sa se determine prin calcul formula compusului dat.
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