Periodic table gets updates for some atomic weights

New Scientist : The order of the elements listed in the periodic table is dependent on the number of protons in the nucleus. However, each element has a variety of isotopes with varying numbers of neutrons in the nucleus, so each isotope has a slightly different mass. What’s more, the relative concentrations of each isotope can vary in different locations and environments. The International Union of Pure and Applied Chemistry (IUPAC) defines the standard atomic weight of the elements as listed on the periodic table based on the weighted mean of the stable isotopes of each element. Two years ago the IUPAC began listing a range of weights instead of a single value for elements that have varying concentrations depending on location and environment. And with the new change it is now listing both bromine and magnesium with ranges. Updates were also made to the weights of germanium, indium, and mercury.