Write the electron configuration of the following ions by using spdf notation: (a) Cr2 , Cr3 , Cr6 ; (b) Mo3 , Mo4 , Mo6 ; (c) Se4 , Se6 , Se2-.

your answer would be a. 12.5 kg

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

is there any options? maybe im just not seeing them but i need the options to

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