What does the x represent on a motion map

You may expect bonds between two atoms which each have n covalent lonic metallic hydrogen

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 are the first three quantum numbers for the electrons located in subshell 2s?