Introduction; Sub- atomic particles; Atomic models – Thomson’s Model; Rutherford’s Nuclear model of atom, Drawbacks;Developments to the Bohr’s model of atom; Nature of electromagnetic radiation; ...

Elements are arranged in the periodic table in order of increasing atomic number. For example hydrogen has the atomic number of one, helium two, lithium three etc. The first energy level (the one ...

Isotopes close isotopesAtoms of an element with the same number of protons and electrons but different numbers of neutrons. are atoms with the same atomic number but different mass number. These two ...