M2C2 Atoms, ions and compounds

• An isotope is the same element with the same number of protons but different number of neutrons, varying the atomic mass
• relative atomic mass is the average mass of an atom of an element, relative to 1/12 the mass of carbon-12
• relative atomic mass = (atomic mass/% abundance)*100
• Hydrogen has three naturally occurring isotopes: protium, deuterium, tritium.
• Reactivity between isotopes of the same element is relatively similar because the number of electrons are the same. Only the physical properties change