- How many electrons are in the electron sea of a 2.92 g sample of potassium metal?

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If f (x)=ax^(2)+bx+c And f (x-1)+f (x)+f (x+1)=x^(2)+1 find f (2)?
I am new to function and I don't know how to solve such questions? Draw the Lewis structure for the conjugate base from the reaction of ethanol with a generic base (B:−).? Find the frequency of the following wavelength;
1.8×10^-5 m? What is the diference between the 2 kindoms Eubacteria and Archaebacteria? Why is it when the dichromate ion reacts with potassium sulfite in an acidic solution it becomes Cr3+?