Where will you look on a science page to find information about an illness

Oxidation state of iron in mohrs salt

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?

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure