Which contribution added to rutherford's discovery of a positive nucleus? atoms are indivisible. electrons are scattered in an atom. neutrons are inside the nucleus of an atom. atoms of the same element have the same properties.

C : " Neutrons are inside the nucleus of an atom" is the answer because, Rutherford  theorized if the neutrons were in the center and the electrons were orbiting in separate energy levels the protons would be in the nucleus to keep the neutrons from floating. If the nucleus has neutral and positive particles, then it will be positive nucleus. Hope this helps

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

let that person have a turn to speak : )