Question

Which is higher in energy , an He+ ion with an electron in an n=3 orbital...

Which is higher in energy , an He+ ion with an electron in an n=3 orbital or a B4+ ion with an electron in an n=7 orbital? Explain your answer and show your work.
What is the wavelength of light required to ionize a hydrogen atom in its ground electron state ? do I need to know the ionization energy. And if so how do I know. which ones am I suppose to know. I'm not given any of the sheet.
If the uncertainty in position of a sodium atom were 10^-4 m what is the uncertainty in its speed.

Please Explain

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