- What is the effective nuclear charge of arsenic?

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Qual é o vigésimo termo da P.A. (-3, -1,1, ...)? Hallemos las coordenadas de los focos y vertices de la hiperbola y2-x2(resolver el ultimo punto)? What is the ratio of NH4+ to NO2- in O2-saturated water when the pH is 8.20 and the pE is 4.42? (Ecell = 0.895)? How can the Distance and Midpoint Formulas be used to identify specfic polygons? Ex: how could you show that a quadrilateral is a rectangle? How do you figure out the answer to these types of questions? There is no explanation on this. Thanks?