Why does an electron orbit so far away from the nucleus?
One time Ernst Rutherford said that that the rotation of electrons around the nucleus like the rotation of the planets around the sun , so the attraction force that made the planets rotate around the sun but wasn’t enough to make these planets stick to the sun due to the centrifugal force . The same in the atom , there is an equality between the attractive force and the centrifugal force ( because the nucleus is positive and the electrons are negative ) between the electrons and the nucleus . In the periodic table the metals have a large atomic radius and non-metals have a small atomic radius , because when you go from left to right the atomic radius decrease and the attraction force between the nucleus and electrons increases .
