Can anyone pls help? (fill in the blank)

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

Calcium chloride +gold(1) 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?