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How to find valency of a transitive element using spdf method. Please explain with examples.? Hi, please help me having difficulty simplifying this question. My answer not matching the memo.? Where is the edge of the universe ? It cant NOT exist....so if there an edge? Use the Bohr model to estimate the Kα X-ray wavelength for a gold atom (Z = 79).? The half life for a first order reaction is 32 s. What was the original concentration if after 2 min the reactant concentration is 0.062 M?