Nitrogen can ionically bond with an unknown element x from group 2. how many ions of element x are required to create a stable ionic compound with nitrogen? a) 2 b) 3 c) 4 d) there is not enough information.

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

0.09 moles of sodium sulfate in 12 ml of solution

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?