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How can you tell if the phone is done charging? I have no idea. It has been charging for a couple hours with a black lightning sign with some blue line going back and forth on it

Your security needs to be updated.

Please list the electron configurations for the highest occupied energy level of the elements in period 3 from left to right.

A block of platinum is 21.45g/cm^3. Calculate its density in kilograms per cubic meter. Please show work. Thank you