Which is classified as an inner transition element

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 formula of the ionic compound composed of calcium cations and chloride anions

What is the chemical name of the compound ti2o3? use the list of polyatomic ions and the periodic table to you answer.