- How do you get the difference of electronegativity in a compound of three or more elements?

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Describe how and where new crust material is made. Describe how and where old crust is destroyed.? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? Questions for medicine I could not get it and I need your help? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? 15.00g of Si reacts with 25.00g of F2 to produce 28.67g of SiF4. Which reactant is the limiting reagent?