3. The structure of a atom: the atoms have different particles which make the atoms then those make elements.All elements have a weight called atomic mass and there is a number to organize the element with a name and number.
4. The role of electrons the electrons move around the nucleus super fast. there are different arrangement of atoms with the big particle and little space. Valence electrons can be lost or gained.
5. there is many different elements, atoms, arrangement, and valence electrons.
