Which of the following statements is true about the total energy of an electron in orbit?
(i) The negative sign in the expression of total energy shows that the electron is nucleus-bound.
(ii) Work needs to be done to pull an electron away from the nucleus.
(iii) The positive value of total energy indicates that the electron is bound to the nucleus.
Only (ii)
Only (iii)
Both (i) and (ii)
Only (i)
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