- What is the maximum number of electrons that can occupy the fourth shell of an atom?

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Need help with recurrences!
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Problem is attached? At what angle (in degrees) does first-order diffraction from layers of atoms 154.9 pm apart occur, using x rays with a wavelength of 145 pm? What happened to (-2x) ?
Why power rule is applied here ?
Can't I apply integration by parts here ? What would happen if we could live on saturn? How would be like.? Is there a website that solve Acid-Base question? For example: calculate pH, pOH, ka... and also titration.?