If a system is in a quantum pure state |a> then would the expected value be the eigenvalue? meaning if we know that the system is in the pure state |a> , then can we predict exactly the outcome of the measurement of the observable x ? which is ?

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

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explanation:

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