Bromine has an atomic mass of 79.9 amu, but only has 2 naturally occurring isotopes, Bromine-79 and Bromine-81. If Bromine-80 does not exist, what does that suggest about the relative abundances of Bromine-79 and Bromine-81? PLEASE HELP ME! 25 POINT

What is avogadro’s number, and why is it useful

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?