Write out the rule for determining total magnification of a compound microscope

What diagram shows the ionic compound of magnesium oxide

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?

What is the percentage of hydrogen in nitrogen trihydride