How many electrons are in each shell of the element Zn? I know there is 30 protons in Zn but how many are in each shell?
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How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

Which material burns faster? metal aluminum

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.