homework: atoms videos

i thik that this videos was very interesting, i learned that the protons and the newtons constitud 99.5% of mass in a atom, protons are thing that make all atoms different and the electron move around atoms, the electrons spin 1.000 thousands kilometers,The neutrons are used to liberate the reserves of energy present in the nucleus of the atoms of a type of uranium called uranium-235, a neutron makes impact on a nucleus of uranium 235 and what breaks, when the electron breaks the nucleus, delivers more neutrons.