The charge on a charged sphere is concentrated at (or on) its . Central Core
Interior
Surface

The charge on a charged sphere is just concentrated in the center of a shell. We can also say that that the charges are being distributed across the charged sphere. This is totally because of the absence of the electric field. In other words, we can say that, inside a conductor, the electric field is zero.

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4d^55s^1 ( third choice)