How is the structure of an atom best described? a negative core surrounded by densely packed matter

a neutral core surrounded by mostly empty space

a positive core surrounded by mostly empty space

a positive core surrounded by densely packed matter

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples