Answer:
Part 1

Part 2

Part 3

Step-by-step explanation:
Given
Number of protons

Radius of nucleus

Distance of the electrons

Part 1
Electric field produced by just outside its surface

Part 2
Electric field produced by just outside its surface

Part 3
The net electric field inside a uniform shell of negative charge is zero because the electric flux lines cancel out each other
hence, the solution is
Part 1

Part 2

Part 3
