Current model of the atom

• Radius of atom 1 × 10^-10 m
• Radius of nucleus of an atom is 1×10^-14 m
• Electrons can absorb EM radiation and move to higher energy levels
• Electrons can emit EM radiation and move down energy levels
• Mass number - The total number of protons and neutrons in an atom
• Atomic number - number of protons in the nucleus of an atom
• Isotope - atom of the same element with same number of protons but different numbers of neutrons