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What electron configurations do atoms usually achieve by sharing electrons to form covalent bonds?

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class

Aprotein molecule in an electrophoresis gel has a negative charge.the exact charge depends on the ph of the solution, but 30 excesselectrons is typical. what is the magnitude of the electric forceon a protein with this charge in a 1500 n/c electric field?