Determine the precision and accuracy of these data for warfarin. Sample 1 Sample 2 Sample 3 Known concentration: 23.2 ng/mL 65.9 239 ng/mLExperimentally determined values: 34.5 60.3 251ng/mL 19.6 (ng/mL) 46.5 231 24.9 59.1 209 21.7 78.4 255 21.6 58.0 201 25.8 61.1 227

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?