The role of Electrons
Electrons do not just spin anywhere around the nucleus. They are found in Shells or energy levels. Electrons (e-) have a negative charge and are very light. They spin around the nucleus at very high speeds. Electrons are placed into shells or energy levels around the nucleus, the first and innermost shell can only hold 2 electrons, on the middle ring it fits 8 electrons and on the outer most shell also fits 8 electrons. Atoms are electrically neutral, they have no charge, therefore the number of protons in an atom equal the number of the elements in an atom. The shells of the atom are called K, L, M and N.